1. Heat the oven to 350 degrees.
2. In a small bowl, mix together the refried beans, chipotle chilies and adobo sauce. Spread a quarter of the mixture over on side of four of the tortillas, then arrange those tortillas on 2 baking sheets.
3. In a large skillet over medium-high, heat the olive oil. Add the onions, peppers, mushrooms and garlic. Sauté until the onion and peppers just soften, about 4 minutes. Add the sausage and sauté for 4 to 5 minutes, or until the sausage begins to brown.
4. Spoon s quarter of the sausage and vegetable mixture over the refried beans on each tortilla. Divide 1½ cups of the cheese among the quesadillas, then top each with a quarter of the olives. Gently press a second tortilla over the top of each, then bake for 15 minutes. Sprinkle a bit of the remaining cheese over each quesadilla, then bake for 5 more minutes.
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