Cheesy Chicken & Pierogie Casserole - cooking recipe

Ingredients

2 lbs of mrs.t's potato & cheddar pierogies
1/2 large onion
2 frozen boneless chicken breasts
2 cups spinach
1 tablespoon butter
10 1/2 ounces cream of mushroom soup
1 cup of shredded cheddar cheese
1 pinch salt & pepper

Preparation

season chicken with salt & pepper to taste then cook chicken breasts in pan, cube & set aside.
saute diced onion in the butter in chicken pan.
cook spinach (I microwave it.) until thawed.
cook pierogies according to package.
mix chicken, onions, spinach & soup together in same pan as before.
spray large (9x13) casserole dish with oil.
layer pierogies, chicken mixture, & cheese in casserole dish.
top w/ cheese.
Bake in 350 degree oven for about 20 minutes & until cheese is melted.
Serve.