Gluten Free Casserole Recipes: Chicken Broccoli Rice Bake

• Cooked rice removes the uncertainty around a dry grain absorbing too much liquid, so the casserole can bake only long enough to heat through and set. That keeps the broccoli green and prevents the chicken from tightening further in the oven.
• The sauce uses cornstarch rather than flour, giving the filling body while keeping the ingredient list naturally aligned with gluten free casserole recipes.
• A modest cheese layer is divided between the filling and top, so each scoop gets savory flavor instead of a heavy, uniform cap.

• 2 cups cooked medium-grain white rice (316 g)
• 2 cups bite-size cooked chicken (280 g)
• 3 cups small broccoli florets (210 g)
• 1 1/2 cups chicken broth (360 g)
• 1 cup whole milk (240 g)
• 2 tablespoons cornstarch (16 g)
• 1 cup shredded sharp cheddar, divided (113 g)
• 1 cup shredded Monterey Jack (113 g)
• 1 teaspoon garlic powder (3 g)
• 1 teaspoon Dijon mustard (5 g)
• 1/2 teaspoon kosher salt (3 g)
• 1/4 teaspoon black pepper (1 g)

Ingredient notes

• Use cooked chicken breast or thigh meat, cut into bite-size pieces. Leftover plainly seasoned chicken works because the sauce supplies the dish’s garlic, mustard, and herb notes. Avoid heavily sweetened or strongly smoked meat, which can steer the casserole away from its straightforward profile.
• Choose short-grain or medium-grain cooked rice for a softer, cohesive filling. Long-grain rice is workable, but its separate grains make the finished squares less tidy. Measure it after cooking, then cool it briefly so it does not overheat the sauce.
• Fresh broccoli florets should be cut small, including peeled tender stem pieces. Their moisture finishes steaming under the cover, while the brief uncovered bake dries the top. Frozen broccoli can work if thawed and thoroughly blotted before it joins the filling.
• Use chicken broth labeled gluten free if that matters for your table, and check the mustard label as well. Those packaged ingredients are where recipe labels can vary.
• Sharp cheddar supplies the main cheese flavor; Monterey Jack melts smoothly and softens its edge. Grate blocks yourself when possible for a looser, more even sauce.

1. 1Gather ingredients

   Heat the oven to 375°F (190°C). Lightly oil a 9-by-13-inch baking dish, then set out the cooked rice, chicken, broccoli, cheese, and measured seasonings. Keeping everything ready matters because the sauce thickens quickly once the cornstarch slurry reaches the hot broth nearby. Do not start it yet.

   

2. 2Make sauce

   Warm the broth and milk in a saucepan over medium heat until steaming. Whisk cornstarch with water in a small bowl, then pour it in while whisking. Cook until the sauce lightly coats a spoon, then stir in garlic powder, mustard, salt, pepper, and half the cheddar.

   

3. 3Combine filling

   Place rice, chicken, and broccoli in a large bowl. Pour over the warm sauce and fold with a broad spatula until every grain is coated. Add Monterey Jack and the remaining cheddar, reserving a small handful for the surface, then transfer the mixture to the prepared dish.

4. 4Cover and bake

   Cover the dish with foil and bake until the broccoli is tender when pierced and the filling is bubbling around the edges. This covered stage warms the casserole before the top is exposed, rather than asking the cheese to protect the vegetables from heat.

5. 5Uncover and finish

   Remove foil, scatter reserved cheese across the top, and return dish to oven. Bake until cheese is melted and the edges look gently browned. If the surface colors before the center bubbles, loosely lay foil over it again and continue baking until the filling is hot throughout.

6. 6Rest and portion

   Set the casserole on a rack and leave it uncovered for 10 minutes. The pause lets the sauce settle into the rice, making portions easier to lift. Spoon onto plates with a crisp salad or roasted green beans, scraping each serving through the saucy edges of dish.

• Keep the sauce at a gentle simmer rather than a hard boil. Cornstarch thickens rapidly, and aggressive bubbling can make it catch on the pan bottom before the cheese is added.
• Use a broad bowl and spatula for folding. Small stirring motions can break tender broccoli florets and compress the rice into dense clumps.
• If your cooked chicken came from the refrigerator, separate any stuck pieces before mixing. This helps the sauce reach the chicken evenly during the covered bake.
• Check the center with a spoon before removing the foil. A hot, bubbling middle matters more than browned corners when deciding whether the casserole is ready.

Serve this casserole with a lemony arugula salad, sliced cucumbers with vinegar, or roasted green beans. The fresh, acidic side cuts through the creamy filling without requiring another complicated pan. For a larger dinner, add a platter of tomatoes, olives, and herbs alongside it. A spoonful of chopped parsley or chives over each plate adds color and a fresh onion note. Keep hot sauce at the table for anyone who wants more heat.