High-Protein Chicken & Broccoli Freezer Rice Casserole (Meal Prep)

Most freezer casseroles turn into a soggy, watery mess once thawed, or they rely on canned condensed soups that spike the sodium without adding real protein. This high-protein chicken and broccoli freezer rice casserole solves both problems. By combining tender chicken breast, crisp broccoli florets, and brown rice with a rich, house-made Greek yogurt and cheddar sauce, you get a comforting 38-gram protein dinner that freezes beautifully and reheats without separating.

Prep Time 20 mins

Cook Time 35 mins

Total Time 55 mins

Servings 6 servings

Protein 38g

Why This Casserole Freezes Exceptionally Well

• Pre-cooked, cooled brown rice: Freshly cooked hot rice releases excess moisture during freezing, which destroys the texture. Using fully cooled, cooked brown rice keeps the grains firm and intact.
• Greek Yogurt + Sharp Cheddar Base: Instead of heavy cream or canned cream of chicken soup, plain Greek yogurt provides a creamy element packed with protein, balanced by sharp cheddar for bold flavor without extra moisture.
• Par-blanched broccoli: Blanching the broccoli for just 90 seconds stops enzyme activity to preserve color and crunch, preventing the florets from turning to mush when baked from frozen or reheated.

If you enjoy high-protein, prep-friendly chicken meals, you might also like these crispy air fryer chicken bites for quick weeknight dinners.

Ingredients

For the Casserole Base:

• 1.5 lbs boneless, skinless chicken breasts, cooked and shredded or diced into ½-inch cubes
• 4 cups fresh broccoli florets, cut into small bite-sized pieces
• 3 cups cooked long-grain brown rice, completely cooled
• 1 tablespoon olive oil
• 1 medium yellow onion, finely diced
• 3 cloves garlic, minced

For the Protein Sauce:

• 1.5 cups plain non-fat or 2% Greek yogurt (at room temperature)
• ½ cup low-sodium chicken broth
• 1.5 cups (6 oz) sharp cheddar cheese, shredded and divided
• 1 teaspoon onion powder
• 1 teaspoon garlic powder
• ½ teaspoon smoked paprika
• 1 teaspoon kosher salt
• ½ teaspoon freshly ground black pepper

Step-by-Step Instructions

1. Preheat and Prep: Position an oven rack in the center position and preheat your oven to 375°F (190°C). Lightly grease a 9x13-inch baking dish with non-stick cooking spray or olive oil.
2. Par-Blanch the Broccoli: Bring a medium pot of salted water to a boil. Add the broccoli florets and boil for exactly 90 seconds until bright green but still crisp. Drain immediately and submerge in an ice bath to stop cooking. Drain well and pat thoroughly dry with paper towels.
3. Sauté Aromatics: Heat 1 tablespoon of olive oil in a skillet over medium heat. Add the diced onion and cook for 4–5 minutes until softened and translucent. Add minced garlic and cook for 60 seconds until fragrant. Remove from heat.
4. Mix the Creamy Sauce: In a large mixing bowl, whisk together the Greek yogurt, chicken broth, onion powder, garlic powder, smoked paprika, salt, pepper, and 1 cup of the shredded cheddar cheese until smooth.
5. Combine Ingredients: Fold the cooked chicken, cooled brown rice, dried broccoli florets, and sautéed onion mixture into the Greek yogurt sauce. Stir until every ingredient is evenly coated.
6. Assemble and Bake (Immediate Meal): Transfer the mixture into the prepared 9x13-inch dish, spreading it into an even layer. Top with the remaining ½ cup of shredded cheddar cheese. Bake uncovered at 375°F (190°C) for 25–30 minutes until bubbling around the edges and the cheese is melted and lightly golden.

How to Freeze and Reheat

Freezing Unbaked (Best Quality)

Assemble the casserole in a freezer-safe foil pan. Do not add the top cheese layer yet. Allow the entire mixture to cool completely in the refrigerator. Cover tightly with a layer of plastic wrap pressed against the surface, then wrap with heavy-duty aluminum foil. Freeze for up to 3 months.

Baking from Frozen: Thaw overnight in the refrigerator for 24 hours. Remove plastic wrap, cover with foil, and bake at 375°F (190°C) for 35 minutes. Uncover, top with remaining ½ cup cheese, and bake for an additional 10–15 minutes until hot throughout. Alternatively, for balanced weekly meal prep options, consider making a batch of these high-protein chicken fried rice containers alongside this casserole.

Packing for Lunch: Portion cooked and cooled casserole into individual airtight glass meal-prep containers. Keep refrigerated for up to 4 days. Reheat in the microwave on HIGH for 1.5 to 2 minutes, stirring halfway through for even heating.

Substitutions & Variations

• Grain Swap: Replace brown rice with cooked white jasmine rice, farro, or cauliflower rice (for a low-carb variation). Ensure cauliflower rice is sautéed and squeezed dry first to remove excess water.
• Protein Options: Leftover rotisserie chicken breast, cooked ground turkey, or diced lean pork tenderloin work seamlessly in this base.
• Dairy-Free Option: Swap Greek yogurt for a dairy-free plain yogurt alternative and use plant-based melting cheese, though overall protein per serving will decrease slightly.

Frequently Asked Questions

Will Greek yogurt curdle when baked? Whisking the Greek yogurt with chicken broth and bringing it to room temperature before mixing prevents curdling. The fat and starch content in the rice and cheese also stabilizes the sauce during baking.

Can I use frozen broccoli instead of fresh? Yes, but thaw the frozen broccoli completely and press out all excess liquid using a clean kitchen towel before folding it into the mixture to prevent soggy rice.

How long does this keep in the fridge for work lunches? Once fully baked and cooled, portioned servings will stay fresh in airtight meal prep containers in the refrigerator for 4 to 5 days.

Can I assemble this casserole a day before baking? Absolutely. Assemble the casserole fully in your baking dish, cover tightly, and refrigerate for up to 24 hours before baking as directed. Add 5 minutes to the baking time if cooking straight from the fridge.

High-Protein Chicken & Broccoli Freezer Rice Casserole

Fit Fork Recipes — Meal Prep / Dinner

Pinterest

Prep: 20 mins

Cook: 35 mins

Total: 55 mins

Servings: 6

Ingredients

• 1.5 lbs boneless, skinless chicken breasts, cooked and shredded
• 4 cups fresh broccoli florets, bite-sized
• 3 cups cooked brown rice, completely cooled
• 1 tbsp olive oil
• 1 medium yellow onion, finely diced
• 3 cloves garlic, minced
• 1.5 cups plain non-fat Greek yogurt (room temperature)
• ½ cup low-sodium chicken broth
• 1.5 cups (6 oz) sharp cheddar cheese, shredded & divided
• 1 tsp onion powder
• 1 tsp garlic powder
• ½ tsp smoked paprika
• 1 tsp kosher salt
• ½ tsp black pepper

Instructions

1. Preheat oven to 375°F (190°C). Lightly grease a 9x13-inch baking dish.
2. Blanch broccoli florets in boiling salted water for 90 seconds. Drain, plunge into an ice bath, then pat thoroughly dry.
3. Sauté diced onion in olive oil over medium heat for 4–5 mins until soft. Add minced garlic; cook 1 min. Remove from heat.
4. Whisk Greek yogurt, chicken broth, onion powder, garlic powder, smoked paprika, salt, black pepper, and 1 cup cheddar cheese in a large bowl.
5. Fold shredded chicken, cooled rice, dried broccoli, and sautéed onions into the yogurt mixture until evenly coated.
6. Spread into the baking dish, top with remaining ½ cup cheddar cheese, and bake uncovered for 25–30 minutes until hot and golden.

Nutrition Information

Serving Size: 1/6th of casserole (~320g)

Nutrient	Amount Per Serving
Calories	410 kcal
Protein	38 g
Total Carbohydrates	32 g
Dietary Fiber	4 g
Net Carbs	28 g
Total Fat	14 g
Saturated Fat	7 g
Sugars	4 g
Sodium	580 mg

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