Rosemary-Garlic Chicken Casserole

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

Tender chicken baked with mushrooms and garlic in a creamy herb sauce, perfect for weeknight dinners. This american-inspired chicken (keto) ready in about 50 minutes pairs boneless skinless chicken thighs, mushrooms, butter for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 414 calories and feeds 4, so it slots cleanly into a low-carb week and pairs well with cauliflower rice or roasted green vegetables. 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.

★ 4.4 (15 ratings) Prep: 15 min Cook: 35 min Serves 4 American cuisine 414 cal/serving
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Ingredients

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Instructions

  1. Step 1: Preheat oven to 375°F (190°C). In a large oven-safe skillet, melt 1 tablespoon butter over medium heat. Add 1 pound diced chicken thighs, season with salt and pepper, and cook for 5-7 minutes until golden brown; remove and set aside.
  2. Step 2: Add remaining 1 tablespoon butter to the skillet with 8 ounces sliced mushrooms and 2 minced garlic cloves. Sauté for 5 minutes until mushrooms are tender and release liquid.
  3. Step 3: Stir in 1 teaspoon fresh thyme, 1/2 cup heavy cream, and 1/4 cup chicken broth. Simmer for 2 minutes until sauce thickens, then return chicken to the skillet. Sprinkle 1/4 cup grated Parmesan over the top and bake uncovered for 15-20 minutes until bubbly and cheese is golden.

Frequently asked questions

How long does Rosemary-Garlic Chicken Casserole take to make?

Total time is about 50 minutes (15 min prep + 35 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Rosemary-Garlic Chicken Casserole?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep mushrooms from drying out.

Can I substitute ingredients in Rosemary-Garlic Chicken Casserole?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Rosemary-Garlic Chicken Casserole for a different number of people?

The recipe is written for 4 servings. Multiply each ingredient by (your serving target / 4). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

Is Rosemary-Garlic Chicken Casserole keto?

Yes — this recipe is tagged keto based on its ingredient list. Always cross-check labels for packaged ingredients (sauces, broths, condiments) since formulations vary by brand.

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