Kraft Singles Sliders

Ingredients

• 1 red onion, cut into 1/2-inch-thick slices
• 1 tomato, cut into 1/2-inch-thick slices
• 2  tsp extra virgin olive oil
• 1 lb lean ground beef
• 1 tbsp dried oregano leaves
• 4 American Cheese Slices, halved
• 8 slider buns, split
• 2 tbsp HEINZ Balsamic Vinegar
• 2 tbsp fresh lemon juice
• 24 baby spinach leaves

Instructions

1. Heat grill to medium-high heat.

2. Brush onions and tomatoes with oil. Grill 2 min., turning tomatoes after 1 min. Remove tomatoes from grill. Grill onions 6 min., turning after 3 min. Cool.

3. Meanwhile, mix meat and oregano; shape into 8 (1/2-inch-thick) patties. Grill 3 to 5 min. on each side or until done (160ºF), topping with Singles pieces and adding buns to the grill to toast for the last 2 min.

4. Chop onions and tomatoes; place in medium bowl. Add vinegar and lemon juice; mix lightly. Spoon onto bottom halves of buns; cover with spinach, burgers and tops of buns.