Apple Bacon Quesadillas

1 package large flour tortillas
6 cups (about 3/4 lb) sharp or smoked cheddar cheese, shredded
2 apples
8 slices bacon
1/2 a large red onion, thinly sliced
Creamy BBQ Dipping Sauce*
1/2 sour cream
3 tablespoons BBQ sauce

1. Cook the bacon slices until crisp. Drain, chop, and set aside. Pour off all but about 1 tablespoon of the fat. (Reserve the bacon fat for another use.) Saute the red onion until lightly browned and caramelized, about 10 minutes.
2. Thinly slice the apple and then coarsely chop.
3. To assemble quesadillas: lay out 3 of the tortillas. Spread a light layer of cheese on each tortilla. Sprinkle with the chopped bacon and cooked onion. Scatter the apple over the bacon and top with remaining cheese and remaining tortillas.
4. Lightly grease a large skillet with cooking spray or oil and heat over a medium flame. Carefully place one quesadilla on the skillet. Press down and cook about 2 minutes, or until lightly browned. Flip the quesadilla and cook the other side for 2 minutes. Remove to a cutting board, or keep warm on a sheet pan in a 250°F oven. Repeat with remaining quesadillas. Cut quesadillas into wedges and serve immediately with creamy bbq sauce.
   
   *For the sauce, mix the sour cream and bbq sauce together.