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This comforting Chicken Gloria casserole features tender chicken breasts baked with golden mushrooms, onions, and a creamy homemade sauce. Perfect for family dinners, it pairs beautifully with rice, pasta, or mashed potatoes.

Ingredients

For the Chicken and Vegetables:

2 ½ lbs chicken breasts (4–5 large), cut into 1-inch thick strips
1 ½ tsp sea salt, plus more to taste
¼ tsp black pepper, plus more to taste
1 cup all-purpose flour (for dredging)
6 Tbsp olive oil, divided
1 lb white mushrooms, thickly sliced
1 medium onion, finely diced
3 garlic cloves, minced

For the Creamy Sauce:

3 Tbsp unsalted butter
3 Tbsp all-purpose flour
1 ½ cups chicken broth
1 Tbsp lemon juice
1 cup half-and-half (or ½ cup milk + ½ cup heavy cream)

Instructions

Prepare the chicken: Season chicken strips with salt and pepper, then dredge lightly in flour. Heat 3 Tbsp olive oil in a large skillet over medium-high heat. Add chicken in batches, sautéing until golden on each side (no need to cook through). Transfer to a 13×9-inch casserole dish.
Cook the vegetables: Wipe the skillet clean if needed. Add remaining 3 Tbsp olive oil, then sauté mushrooms and onions until soft and golden. Stir in garlic and cook for 1–2 minutes. Spread mixture evenly over the chicken in the casserole dish.
Make the sauce: In a medium saucepan (or the same skillet), melt butter. Whisk in flour and cook for 1–2 minutes until lightly golden. Gradually whisk in chicken broth, lemon juice, and pepper until smooth. Stir in half-and-half and bring to a gentle simmer. Season generously with salt and pepper.
Assemble and bake: Pour the sauce evenly over the chicken and mushroom mixture. Cover with foil and bake at 350°F (175°C) for 45 minutes.
Serve: Enjoy warm over mashed potatoes, rice, or pasta.

Why You’ll Love This Recipe

Creamy, savory comfort food with rich flavor.
A complete meal when paired with your favorite starch.
Family-friendly and perfect for gatherings.
Can be made ahead for easy weeknight dinners.

Tips

Don’t overcrowd the pan: Sauté chicken in batches for a golden crust.
Homemade broth makes a difference: Use high-quality chicken broth for the richest sauce.
Cover while baking: Keeps the chicken tender and prevents the sauce from drying out.
Let it rest: Allow the casserole to sit for 5 minutes before serving so the sauce thickens slightly.

Variations and Substitutions

Add cheese: Top with shredded mozzarella, parmesan, or Swiss before baking for extra richness.
Use chicken thighs: Boneless, skinless thighs also work and add juiciness.
Add veggies: Spinach, peas, or carrots can be stirred into the sauce for a heartier dish.
Gluten-free option: Use a gluten-free flour blend for dredging and thickening.
Lighter version: Replace half-and-half with whole milk for a lighter sauce.

FAQs

Can I make this ahead of time?
Yes! Assemble the casserole, cover tightly, and refrigerate for up to 24 hours before baking. Add an extra 5–10 minutes of bake time if starting from cold.

Can I freeze it?
Yes, freeze before baking for up to 2 months. Thaw overnight in the fridge before baking.

How do I know the chicken is fully cooked?
Chicken should reach an internal temperature of 165°F (74°C).

Serving Suggestions

Serve with creamy mashed potatoes, buttered noodles, or fluffy rice.
Add a crisp green salad or roasted vegetables for balance.
Warm bread or dinner rolls are perfect for soaking up the creamy sauce.
Pairs beautifully with a light white wine like Chardonnay or Pinot Grigio.