Spinach Squares - cooking recipe

Ingredients

4 Tbsp. butter or margarine
3 eggs
1 c. flour
1 c. milk
1/2 tsp. salt
1 tsp. baking powder
1 lb. Cheddar cheese, grated
1 (10 oz.) pkg. frozen chopped spinach or broccoli, thawed and drained
1 small onion, chopped
1/2 c. mushrooms, chopped (optional)

Preparation

Preheat oven to 350\u00b0.
Melt butter in a 13 x 9-inch pan.
Mix remaining ingredients together in large mixing bowl.
Spoon into pan.
Bake for 35 minutes.
Cool slightly before cutting into squares.
Serve warm or at room temperature.