Quick Quiche

4 eggs
1 c half-and-half
½ c mayonnaise
2 Tbsp flour
1/3 c diced onions
Salt and garlic powder
3 ounces shredded Swiss or sharp cheddar cheese
1 pkg frozen chopped spinach
1 9-inch unbaked pie shell

Preheat oven to 350. Whip eggs, half-and-half, mayonnaise and flour in a medium mixing bowl. Add remaining ingredients. Pour into unbaked pie crust. Bake for 45 to 60 minutes or until the top is golden brown.