Preheat oven to 375°F.
In a small bowl, combine cracker crumbs and butter.
Press onto the bottom of a greased 9-in. springform pan and sprinkle with cheddar cheese.
In a large skillet, saute the zucchini, mushrooms, onion and red pepper in oil until tender. Spoon over cheese.
In a large bowl, beat cream cheese until smooth.
Add eggs; beat on low speed just until combined. Stir in bacon and pour over vegetable mixture. Sprinkle with Parmesan cheese.
Place springform pan on a baking sheet and bake at 375°F for 30-35 minutes or until center is almost set. Cool on a wire rack for 10 minutes.
Carefully run a knife around edge of pan to loosen; remove sides of pan.
Serve warm or chilled. Refrigerate leftovers!