PREHEAT oven to 425°F. Heat oil in large skillet on medium heat. Add peppers and carrots; cook and stir 5 min. Reduce heat to low. Stir in salsa and corn; simmer 5 min., stirring occasionally.
SPOON about 1/4 cup of the vegetable mixture onto half of each tortilla; sprinkle each with 2 Tbsp. of the cheese. Fold tortillas in half; place on baking sheet sprayed with cooking spray. Press top of each tortilla gently into filling to secure.
BAKE 5 min. or until cheese is melted. Serve with BREAKSTONE'S or KNUDSEN Sour Cream, if desired.