Basic Quiche - cooking recipe

Ingredients

1/2 cup finely chopped yellow onion
olive oil
3 eggs, lightly beaten
3/4 cup milk
1/2 teaspoon Dijon mustard
salt, to taste
ground black pepper, to taste
1 cup shredded swiss cheese or 1 cup sharp cheddar cheese
9 inches unbaked pie shells

Preparation

Preheat oven to 375 degrees. In a small skillet saute onion in a little oil until tender, set aside to cool.
In a medium mixing bowl stir together eggs, milk, mustard, salt, pepper, cheese, and onions. Pour mixture into pie shell and bake until knife inserted into the center comes out clean, 40 to 50 minutes.