Cook beef, onion and garlic in 10-inch skillet over medium heat, stirring until beef is brown.
Stir in remaining ingredients except tortillas, butter and salsa. Heat to boiling, reduce heat to low and simmer uncovered for 20 minutes. Stir occasionally.
Preheat oven to 500 degrees.
Spoon about ½ cup beef mixture onto center of each tortilla. Fold one end of tortilla up just past beef mixture.
Fold left and right sides in over folded edge. Fold remaining end down. (Like swaddling a baby!)
Place in 9 x 13 pan, seam-side down.
Continue until all tortillas are filled.
Brush tops with softened butter.
Bake 8 to 10 minutes, until tortillas are golden.
Double the recipe. The leftovers make great snacks.