Heat the oven to 350 degrees. Coat 6 muffin cups with cooking spray. Using a bowl or cookie cutter as a guide, cut out 4-inch rounds from each tortilla. Place the tortilla rounds into the muffin cups; coat with cooking spray. Whisk the eggs and sour cream in a medium bowl until blended. Stir in the green onions and cilantro; divide between the tortilla cups. Top with the bell peppers and cheese. Bake for 15 minutes or until puffed and a knife inserted in the center comes out clean. Serve with additional sour cream and salsa, if desired.