1 c. milk
3 tbsp. butter
1/2 tsp. salt or to taste
6 lg. eggs
1 onion, sm. cut into 1/2 inch pieces
1 (10 oz.) pkg. frozen chopped spinach thawed and squeezed dry
1 c. Muenster cheese

About 1 hour before serving: Preheat oven to 375 degrees. Grease a 12 inch quiche pan or a 9 x 9 inch baking pan. In a blender at high speed blend milk, butter, salt, eggs, and onion until smooth. Pour into baking or quiche pan.

Stir spinach into egg mixture until evenly distributed. Bake until pie is set, about 20 minutes. Remove from oven and sprinkle with cheese. Bake about 5 more minutes or until cheese melts. Cut into wedges.