Impossible Ham Pie

Source: Diana's Kitchen

2 cups milk
2 cups diced cooked ham
1 cup Swiss cheese, shredded
1/3 cup chopped onion
4 eggs
1 cup Bisquick Baking Mix
1/8 teaspoon pepper

Grease pie plate and preheat oven to 400°. Sprinkle ham, cheese and onion in pie plate. Blend or process remaining ingredients on high speed until smooth. Pour over the ingredients in pie plate. BAKE 35 to 40 minutes, until a knife inserted in the center comes out clean. Cool 5 minutes before serving.
Serves 6.