4 strips bacon
1 sm. onion, chopped
2 tbsp. butter
1 1/2 c. milk
3 eggs, beaten
1/2 c. Bisquick mix
1 c. (4 oz.) grated sharp cheese
1/4 tsp. salt
1/2 tsp. dry mustard
1 (3 1/2 oz.) can sliced mushrooms, drained

Heat oven to 375 degrees. Fry bacon until crisp; then drain and crumble. Saute onion in butter until transparent. Combine all remaining ingredients, except mushrooms, in a mixing bowl. Add bacon and onion. Mix thoroughly with mixer or process briefly in blender. Pour into a lightly greased 9-inch quiche pie pan or a 9-inch square cake pan.

Bake 35 minutes or until knife inserted in center comes out clean. Allow to stand at least 5 minutes before cutting into wedges or squares. Makes 6-8 main dish servings or 24 bite-size servings.