Preheat oven to 450 degrees .
In a skillet, brown beef onions, corn, peppers, garlic, taco seasoning and oregano over medium heat.
Remove from heat and then add refried beans, enchilada sauce and canned chilies. Mix together.
Spoon the beef mixture in the center of each tortilla, and top with cheese and tomatoes.
You’re now going to fold the tortilla so that it creates a pocket in the shape of a square. Fold the right and left side of the tortilla towards the middle, turn 90 degrees and repeat so that all sides of the tortilla are folded to the middle. Repeat for all 8 tortillas.
Place seam-side down onto a baking sheet.
Brush the tortillas with the melted butter.
Bake for 30 minutes or until golden brown.
Garnish with sour cream and salsa, if desired.