1In 10-inch skillet, cook and stir beef over medium-high heat about 5 minutes or until thoroughly cooked; drain. Add onion and garlic; cook 1 minute or until onion is soft.
2Make potatoes as directed on box omitting butter and using 1 cup water, 1/2 cup milk and the 1 pouch Cheese Sauce. In medium bowl, mix potatoes and ground beef mixture.
3Heat sandwich/panini grill press to medium heat. Brush tortillas with oil. Place about 3 tablespoons potato mixture on half of each tortilla; top with 1 slice of cheese. Fold tortillas over filling.
4When grill press is heated, place tortillas on grill. Close grill; cook 1 to 2 minutes or until cheese is melted and filling is hot. Serve quesadillas with salsa, sour cream and cilantro.