Baked Whole30 Chicken and Broccoli Casserole with Cauliflower Rice

By AislePrompt Editorial · Published 2026-05-28 · Updated 2026-05-28

Tender chicken thighs baked with crisp broccoli, earthy mushrooms, and a savory sauce served over fluffy cauliflower rice for a comforting Whole30 dinner. This American-inspired Whole30 recipe (gluten free), ready in about 50 minutes, pairs boneless skinless chicken thighs, broccoli florets, white mushrooms for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 360 calories and feeds 4, so it slots cleanly into a Whole30 week and pairs well with roasted sweet potato or a simple olive-oil salad. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Ingredients

• 1 lb boneless skinless chicken thighs
• 3 cups broccoli florets
• 1 cup, sliced white mushrooms
• 3 cups cauliflower rice
• 3 tbsp olive oil
• 4, minced garlic cloves
• 2 tbsp coconut aminos
• 1 cup chicken broth
• 1 tsp dried thyme
• 1 tsp salt
• 1/2 tsp black pepper
• 1 tbsp lemon juice

Baking dishes worth owning for casseroles like this → Best Bakeware for 2026: Top Picks + Buying Guide

Instructions

1. Step 1: Preheat oven to 375°F. Toss 3 cups broccoli florets and 1 cup sliced white mushrooms with 1 tbsp olive oil, 1/2 tsp salt, and 1/4 tsp black pepper; spread evenly in a 9x13-inch baking dish.
2. Step 2: Heat 2 tbsp olive oil in a large skillet over medium-high heat. Add 1 lb boneless skinless chicken thighs, seasoned with 1/2 tsp salt and 1/4 tsp black pepper, and sear for 4 minutes per side until golden but not fully cooked.
3. Step 3: Remove chicken and add 4 minced garlic cloves to the skillet, sauté for 1 minute until fragrant. Stir in 2 tbsp coconut aminos, 1 cup chicken broth, 1 tsp dried thyme, and 1 tbsp lemon juice; simmer for 3 minutes until sauce slightly thickens.
4. Step 4: Place seared chicken thighs on top of the broccoli and mushrooms in the baking dish and pour the sauce evenly over everything.
5. Step 5: Bake uncovered for 25 minutes until chicken is cooked through and broccoli is tender.
6. Step 6: Meanwhile, heat a separate skillet over medium heat and sauté 3 cups cauliflower rice with a pinch of salt for 5 minutes until warmed through and slightly tender.
7. Step 7: Serve baked chicken casserole over the warm cauliflower rice for a nourishing Whole30 meal.