HEAT grill to medium-high heat. COOK macaroni in medium saucepan as directed on package, omitting salt; drain. Return macaroni to pan. Add VELVEETA® and milk; cook on low heat 5 min. or until VELVEETA® is completely melted and mixture is well blended, stirring constantly. SPOON macaroni mixture into pepper halves; wrap with bacon to completely enclose filling, overlapping edges of bacon as needed. Secure with wooden toothpicks. Cover grill grate with foil. Place peppers, cut sides down, on foil. GRILL 20 min. or until bacon is crisp and peppers are heated through, turning after 10 min. Remove and discard toothpicks before serving peppers. Kraft Kitchens Tips: Variation: These delicious poppers can be baked in the oven instead of cooking them on the grill. Heat oven to 400°F. Stuff peppers as directed. Secure each popper with wooden toothpick. Place, cut sides up, on foil-covered baking sheet, sprayed with cooking spray. Bake 20 min. or until bacon is crisp and peppers are heated through. Special Extra: Prepare using jalapeño VELVEETA®.