Spinach Casserole - cooking recipe

Ingredients

3 c. Rice Chex, crushed to 1 1/2 c.
1 tsp. onion powder
3 Tbsp. margarine, melted
1 (8 oz.) pkg. cream cheese
1 (5 oz.) can evaporated milk
2 tsp. lemon juice
3/4 tsp. season salt (or to your taste)
dash of white pepper (to your taste or leave out)
1 (8 oz.) can sliced mushrooms, drained (reserve 1/3 c. liquid)
1 egg, well beaten
1 (10 oz.) pkg. frozen chopped spinach, cooked and drained

Preparation

Chex Mix Topping:
Combine Chex and onion powder.
Stir in margarine and set aside.