In a large skillet, saute the onion, green pepper, cumin and pepper in oil until vegetables are tender. Add garlic; cook 1 minute longer. Add beans and broth. Bring to a boil; cook until liquid is reduced to about 1/3 cup. Stir in corn and green onions; remove from the heat.
Place one tortilla in a 9-in. springform pan coated with cooking spray. Layer with 1-1/2 cups bean mixture and 1/4 cup cheese. Repeat layers twice. Top with remaining tortilla. Place pan on a baking sheet.
Bake, uncovered, at 400° for 15-20 minutes or until heated through. Remove sides of pan. Sprinkle with remaining cheese. Cut into wedges.