In a small bowl, combine cracker crumbs and butter. Press onto the bottom of a greased 9-in. springform pan.
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.
Pour over vegetable mixture.
Sprinkle with Parmesan cheese.
Place pan on a baking sheet.
Bake at 375° 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.