Preheat oven to 375 degrees.
3 large McIntosh (or other tart baking apples) peeled, sliced and cut in half
1½ cups grated cheddar cheese
6 slices of bacon, cooked and broken into 1 inch pieces
1½ cups milk
1 cup Bisquick
½ cup flour
Butter an 8" x 11½" casserole dish. Layer apples in bottom, sprinkle cheese over apples, then bacon over cheese.
In a large bowl, beat eggs. Add milk and beat together. Add Bisquick and flour and beat into a batter. Pour over apples, cheese and bacon.
Bake for 45 minutes or until top is well browned and quiche is cooked through.