Meatball Provolone Burgers w/Garlic Parmesan Aioli

Ingredients

1. Garlic Parmesan Aioli
2. 1/3 cup mayonnaise
3. 2 tablespoons grated Parmesan cheese
4. 2 cloves garlic, finely chopped
5. Burgers
6. 1 lb lean (at least 80%) ground beef
7. 1/2 cup Italian style panko crispy bread crumbs
8. 1/4 cup milk
9. 1/2 teaspoon salt
10. 1/4 teaspoon pepper
11. 1 small onion, very finely chopped (1/4 cup)
12. 1 small green bell pepper, cut into rings
13. 1 small red bell pepper, cut into rings
14. 2 tablespoons olive oil
15. 4 slices provolone cheese
16. 4 ciabatta buns, split

Instructions

1. 1In small bowl, mix Garlic Parmesan Aioli ingredients; cover and refrigerate. Heat gas or charcoal grill. In medium bowl, mix beef, bread crumbs, milk, salt, pepper and onion. Shape mixture into 4 patties, about 1/2 inch thick. Make indentation the size of a quarter in center of each burger so burgers remain level during grilling.
2. 2Place patties on grill over medium heat. Cover grill; cook 10 to 12 minutes, turning once, until meat thermometer inserted in center of patties reads 160°F. Toss green and red bell pepper rings with oil to coat. Add bell pepper rings to side of grill for last 8 to 10 minutes of cooking, turning once, until crisp-tender. During last 2 minutes of cooking, top each patty with cheese. Cook until cheese is melted.
3. 3Spread about 1 tablespoon Garlic Parmesan Aioli mixture on cut sides of buns. Place burgers on bottom halves of buns; top with peppers. Cover with top halves of buns.