Impossible Seafood Pie

1 (6 ounce) package frozen crabmeat, thawed and drained
1 cup shredded sharp cheese
3 ounces cream cheese, cut into 1/4-inch cubes
1/4 cup chopped onion
1 1/2 cups milk
1 cup Bisquick
4 eggs
1/4 teaspoon salt
Dash of nutmeg

Heat oven to 400 degrees F. Lightly grease a 10-inch pie plate.

Mix crabmeat, cheeses and onion in pie plate.

Mix remaining ingredients in blender until smooth (15 seconds on high). Slowly pour liquid mixture into pie plate. Bake until golden brown for 35 to 40 minutes. Let stand 5 minutes before cutting.