1 (4 1/2 oz.) can sliced mushrooms
1 c. shredded Swiss cheese
1/3 c. chopped onion
2 c. milk
1 c. Bisquick
4 eggs
1/4 tsp. salt
1/8 tsp. pepper
Sprinkle mushrooms, cheese, and onion into greased 10-inch quiche or pie dish.  Beat remaining ingredients in a blender for 15 seconds. Pour over cheese