Crispy Rice Cups

Crispy rice cups are cooked short-grain rice pressed into an oiled muffin tin and baked until the outside turns into a golden, crackling shell while the inside stays chewy, then filled with whatever a party needs. Here the filling is a stuffed mushroom turned inside out: cremini mushrooms browned dry with shallot, garlic and thyme, bound with cream cheese and Parmesan and finished under a Parmesan crust, so each cup tastes like a stuffed mushroom with a crisp rice base instead of a wet cap. They are gluten-free by nature, they use leftover rice better than fried rice does, and a standard muffin tin makes twelve.

The recipe card at the bottom has the amounts and numbered steps for 12 cups, enough for six as a starter. This guide covers why short-grain rice is the only rice that works, how to cook and season it, why cold rice presses and crisps better than fresh, the bake, the mushroom filling and why it is cooked dry, the one food-safety rule that matters with cooked rice, and other fillings. It sits in the site's recipes collection next to the Boursin stuffed mushrooms, which is the same idea with the mushroom as the cup.

Why Short-Grain Rice Is the Only Rice That Works

A rice cup has to hold together without a binder, and that is a question of starch. Rice starch is two molecules, amylose and amylopectin, in different proportions by variety; Harvard's Nutrition Source explains that long grains stay separate and fluffy when cooked while short grains yield the stickiest texture, and that the stickiness comes from amylopectin, the branched starch that glutinous rice is made of almost entirely and that short-grain rice carries far more of than long. That cling is what lets sushi rice be shaped into a cup that survives the oven and a filling. Long-grain rice, basmati or jasmine, crumbles out of the tin no matter how hard it is pressed. Buy rice labeled sushi rice, Calrose, or short-grain; medium-grain works nearly as well.

Cook it the Japanese way. The University of Illinois's guide to Japanese home cooking has you rinse the rice in a deep bowl, scrubbing it with your hand and pouring off the cloudy water four or five times until it runs almost clear, which strips the loose surface starch that would otherwise cook into a gluey paste; then cook it with a little less water than usual and, once it is done, fluff it and let it rest covered for 15 minutes. Season the warm rice with rice vinegar, a little sugar and salt, as for sushi, and a tablespoon of oil, which coats the grains so they release from the tin. The vinegar is not decoration: its acid brightens a filling this rich.

Press Cold Rice, Bake Hot: The Crisp

Use rice that has cooled, and day-old refrigerated rice is best of all. Freshly cooked rice is soft and steamy and presses into a paste; as cooked rice cools, its gelatinized starch recrystallizes and the grains firm up, the same retrogradation that makes yesterday's rice the right rice for fried rice. Firm grains pack into a cup that keeps its walls, and their drier surface crisps faster. Brush a standard 12-well muffin tin generously with oil, drop a scant third of a cup of rice into each well, and, with wet fingers so the rice does not stick to you, press it firmly across the bottom and up the sides into a thick-walled cup with a hollow center. Press hard; a loosely packed cup has air pockets and breaks when it comes out. Brush the rims and outsides with more oil.

Bake the empty cups at 425°F for 25 to 30 minutes, until the rims and outer walls are deep golden and the cups slide out of the tin when nudged. Crisping is drying: the oil carries the oven's heat into the rice surface, the surface water boils off, and only once it is gone can that surface climb past 212°F to where the rice browns, from about 284°F; that is why a dry-pressed, oiled cup crisps and an unoiled one steams pale. The inside stays chewy because it never dries out, and that contrast is the point. If the cups stick, run a thin knife around them; if they are pale at 30 minutes, the rice was too wet or the oil too thin, and another 5 minutes will fix the first batch and inform the second.

The Stuffed-Mushroom Filling, Cooked Dry

The filling is the inside of a stuffed mushroom without the cap. Chop 8 ounces of cremini mushrooms fine with a shallot and cook them in butter and olive oil over medium-high heat until every trace of liquid has cooked off and the mushrooms are browned, 8 to 10 minutes. Mushrooms are about nine parts water, and that water has to leave in the pan, not in the rice cup; a filling that is still wet turns the crisp base soggy from the inside within minutes. Add the garlic and thyme for the last minute, then a teaspoon of soy sauce, which carries the glutamic acid that Kikkoman explains is produced during its months-long koji fermentation and reads on the tongue as more mushroom rather than as soy. Off the heat, stir in the cream cheese, most of the Parmesan, the panko and parsley. On cleaning the mushrooms, the Mushroom Council says a quick rinse and a pat dry is fine; what matters is that they go into the pan dry.

Fill each baked cup with a heaping tablespoon of the mushroom mixture, top with the remaining Parmesan, and return the tin to the oven for 8 to 10 minutes, until the cheese has melted into a golden crust and the filling is hot. The second bake is short on purpose: the cups are already crisp, the filling is already cooked, and all the oven has to do is fuse the two and brown the cheese. Rest 5 minutes in the tin, then lift the cups out with a small offset spatula and finish with parsley. The same cooked-dry mushroom base is the start of the site's mushroom risotto.

The One Rule for Cooked Rice, Make-Ahead, and Other Fillings

Cooked rice has a food-safety rule that most recipes skip. Raw rice carries dormant spores of a bacterium called Bacillus cereus that survive cooking, and if cooked rice sits at room temperature the spores wake and produce a toxin that no amount of reheating destroys. North Carolina State University Extension puts it plainly: the toxin is heat resistant, so cool cooked rice as soon as possible after cooking, from hot to 70°F within 2 hours and to refrigerator temperature within 4 more, and throw it out if it missed that window. So the "day-old rice" in this recipe means rice that was spread on a sheet pan to cool quickly and refrigerated, not rice left on the counter overnight. Kept cold, it is fine for several days.

Make-ahead: bake the empty cups up to a day ahead and store them airtight at room temperature; the filling keeps 2 days refrigerated. Fill and do the second bake just before serving, adding a couple of minutes for a cold filling. Baked, filled cups re-crisp on a sheet pan at 400°F for 6 to 8 minutes; a microwave softens the shell. The cup takes any filling that is cooked and not wet: the crab rangoon mixture, a spicy tuna or salmon mix added cold after baking, buffalo chicken with blue cheese, or a spoon of the caramelized onion dip warmed with Gruyère.

Crispy Rice Cups (Stuffed Mushroom Filling)

Seasoned cooked sushi rice pressed into an oiled muffin tin and baked at 425°F until golden and crisp, filled with cremini mushrooms browned dry with shallot, garlic and thyme and bound with cream cheese and Parmesan, then baked again under a Parmesan crust. Makes 12.

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Prep Time 25 minutes mins

Cook Time 40 minutes mins

Course Appetizer

Servings 6 servings

Calories 260 kcal

Ingredients

  

• For the rice cups
• 1½ cups short-grain (sushi) rice
• 1 Tbsp rice vinegar
• 1 tsp sugar
• ½ tsp fine sea salt
• 3 Tbsp neutral oil, divided
• For the filling
• 8 oz cremini mushrooms, finely chopped
• 1 shallot, finely chopped
• 1 Tbsp unsalted butter
• 1 Tbsp olive oil
• 2 garlic cloves, minced
• 1 tsp fresh thyme leaves
• 1 tsp soy sauce
• ¼ cup cream cheese, softened
• ½ cup finely grated Parmesan, divided
• 2 Tbsp panko breadcrumbs
• 2 Tbsp chopped flat-leaf parsley, plus more to finish
• Salt and black pepper

Instructions

 

• Rinse the rice in a bowl of cold water, rubbing it with your hand and pouring off the cloudy water, 4 or 5 times until it runs almost clear. Cook it in 1¾ cups water (in a rice cooker or covered pot on low, 15 minutes), then fluff and rest covered 15 minutes. Stir in the vinegar, sugar, salt and 1 tablespoon of the oil. Spread on a sheet pan to cool quickly, then refrigerate at least 1 hour or overnight.
• Heat the oven to 425°F (220°C). Brush a 12-well muffin tin generously with 1 tablespoon oil. With wet fingers, press a scant ⅓ cup of cold rice firmly into each well, across the bottom and up the sides, into a thick-walled cup. Brush the rims with the remaining oil.
• Bake 25 to 30 minutes, until the rims and outer walls are deep golden and the cups slide free when nudged.
• Meanwhile, cook the mushrooms and shallot in the butter and olive oil in a skillet over medium-high heat, stirring, until all the liquid has evaporated and they are browned, 8 to 10 minutes. Add the garlic and thyme and cook 1 minute, then the soy sauce. Off the heat, stir in the cream cheese, ¼ cup of the Parmesan, the panko and parsley. Season with salt and pepper.
• Fill each cup with a heaping tablespoon of the mushroom mixture and top with the remaining ¼ cup Parmesan. Bake 8 to 10 minutes, until the cheese is melted and golden. Rest 5 minutes, lift out with a small offset spatula, and finish with parsley.

Notes

Short-grain rice only; long-grain crumbles. Cold rice presses and crisps better than fresh, but cool cooked rice fast on a sheet pan and refrigerate; never leave it out. Cook the mushrooms until dry or the cups go soggy from inside. Empty cups keep a day airtight; filling keeps 2 days; fill and bake just before serving.

More for the party table: Boursin stuffed mushrooms, crab rangoon cups, and baked caprese bites. Same day-old rice: Gordon Ramsay's fried rice.

Crispy Rice Cups FAQs

The questions that come up most: what rice to use, why the cups fell apart, how long to bake them, whether leftover rice works, whether they can be made ahead, whether an air fryer works, what other fillings to use, and whether they are gluten-free.