Creamy Chicken and Mushrooms (Oven & Slow Cooker Instructions)

Name: Creamy Chicken and Mushrooms (Oven & Slow Cooker Instructions)
Cuisine: American, World Cuisine
Ingredients: 4 lbs Chicken breast, skinless and boneless; 2 lbs Mushrooms, whole button or cremini; 1 Onion, small and diced; 4 cloves Garlic, minced; 2 tsp Kosher salt; 1 tsp black pepper; 1 tsp dried thyme; 1tsp Dried rosemary; 1/2 tsp paprika; 6tbsp Butter; 6 tbsp flour; 3.5 cups chicken broth; 1.5 cups heavy cream; .5 cups sour cream; .5 cups parmesan cheese, grated; 1tbsp Dijon mustard (Optional); A pinch of Nutmeg, (Optional)

21 steps

Best served with mashed potatoes and a green veggie like broccoli or zucchini.

Updated at: Sat, 28 Feb 2026 00:36:31 GMT

Nutrition balance score

Unbalanced

Glycemic Index

Low

Glycemic Load

Low

Nutrition per serving

Calories602.8 kcal (30%)

Total Fat34.7 g (50%)

Carbs12.8 g (5%)

Sugars5 g (6%)

Protein59.6 g (119%)

Sodium1039.2 mg (52%)

Fiber1.8 g (6%)

% Daily Values based on a 2,000 calorie diet

Ingredients

8 servings

4 lbsChicken breast

skinless and boneless

2 lbsMushrooms

whole button or cremini

1 tspblack pepper

1 tspdried thyme

1 tspdried rosemary

½ tsppaprika

6 TbspButter

6 Tbspflour

3 ½ cupschicken broth

1 ½ cupsheavy cream

½ cupssour cream

½ cupsparmesan cheese

grated

1 TbspDijon mustard

Optional

Nutmeg

Optional

Instructions

Oven Instructions

Step 1

Preheat oven to 375°F.

Step 2

Lightly grease two 9x13 casserole dishes (or one deep large roasting pan).

Step 3

Toss mushrooms, onion, and garlic with a little oil, salt, and pepper.

Step 4

Spread evenly in the bottom of the dishes.

Step 5

Nestle seasoned chicken pieces on top.

Step 6

In a sauce pan, melt butter over medium heat.

Step 7

Whisk in flour and cook 1–2 minutes (light golden roux).

Step 8

Slowly whisk in broth until smooth.

Step 9

Simmer until thick.

Step 10

Stir in cream, sour cream, parmesan, mustard, and spices.

Step 11

Simmer until thick enough to coat a spoon. (You want it slightly thicker than you think — it thins in the oven.)

Step 12

Pour sauce evenly over chicken and mushrooms.

Step 13

Cover tightly with foil.

Step 14

Bake 35–45 minutes, until chicken hits 165°F internally.

Step 15

Uncover the last 10 minutes if you want slight browning on top.

Step 16

Optional Finishes: Sprinkle chopped parsley. A tiny squeeze of lemon to brighten it. Black pepper on top right before serving.

Slow Cooker Instructions

Step 17

In the slow cooker, add mushrooms, onion, garlic. Season the chicken and lay it on top. (Do not add cream yet.)

Step 18

On the stove: Melt butter and whisk in flour. Cook 1–2 minutes. Slowly whisk in broth and simmer until thick (almost gravy consistency). Stir in: Thyme, rosemary, paprika, and Dijon if using. (Do not add cream, sour cream, or parmesan yet.)

Step 19

Pour this thick base over the chicken and turn on slow cooker. Low: 5–6 hours High: 3–4 hours

Step 20

About 30 minutes before serving: Whisk together heavy cream and sour cream. Stir into the slow cooker. Add parmesan.

Step 21

Let cook uncovered for 20–30 minutes to thicken. (Tip: If it's not thick enough, mix 1 tbsp cornstarch and 1 tbsp cold water and stir in. Allow to cook for another 5-10 minutes while it thickens.)