Preheat the oven to 350°F, and grease a 9x13-inch baking dish.
Cook the mushrooms over medium heat with the butter, thyme, and salt until they shrink considerably and are no longer releasing liquid.
3 cups sliced mushrooms, 1 tablespoon unsalted butter, ½ teaspoon dried thyme, ½ teaspoon salt
Blanch the broccoli in salted boiling water for 1–2 minutes. Drain well.
3 cups broccoli florets
In the large mixing bowl, combine the chicken, rice, broccoli, mushrooms, soup, onion dip, and ½ cup of the cheese.
1 pound cooked chicken, 3 cups cooked rice, 2 (10 ½ ounce) cans cream of mushroom soup, 16 ounces refrigerated french onion dip
Spread the mixture into the baking dish. Top with the remaining 1 ½ cups of cheese.
Cover with foil and bake for 20–25 minutes.
Remove the foil. Add the french fried onions. Bake for 5 more minutes.
6 ounces french fried onions
Let the casserole rest for 10–15 minutes before serving.
Notes
The calories listed are an approximation based on the ingredients in the recipe card and a serving size of 1 ½ cups of casserole. Actual calories will vary.
I love to use rotisserie chicken in this dish, but any pre-cooked chicken works.
Store leftovers in an airtight container in the refrigerator for up to 3 days.
Nutrition Facts
Chicken Mushroom Broccoli Casserole Recipe
Serving Size
1.5 cups
Amount per Serving
Calories
600
% Daily Value*
Fat
35
g
54
%
Saturated Fat
17
g
85
%
Trans Fat
0.1
g
Polyunsaturated Fat
1
g
Monounsaturated Fat
4
g
Cholesterol
86
mg
29
%
Sodium
1574
mg
66
%
Potassium
528
mg
15
%
Carbohydrates
37
g
12
%
Fiber
2
g
8
%
Sugar
5
g
6
%
Protein
32
g
64
%
Vitamin A
556
IU
11
%
Vitamin C
31
mg
38
%
Calcium
310
mg
31
%
Iron
1
mg
6
%
* Percent Daily Values are based on a 2000 calorie diet.