Greek-Style Burgers with Feta Aioli

Greek-Style Burgers with Feta Aioli
from Cooking Light

This burger--stuffed with roasted bell peppers and spinach-- carries Greek flavors in every bite. We've topped it with a tomato slice, lettuce leaves, and our low-fat version of the garlicky French mayonnaise aioli (ay-OH-lee) made more flavorful by adding feta cheese.

Aioli:
1/2 cup (2 ounces) crumbled feta cheese
2 tablespoons light mayonnaise
2 tablespoons plain fat-free yogurt
1/4 teaspoon coarsely ground black pepper
1 garlic clove, minced

Burgers:5 (1/2-inch-thick) slices red onion
Cooking spray
1 pound lean ground round
2/3 cup fresh breadcrumbs
1/3 cup chopped bottled roasted red bell peppers
1/4 cup chopped fresh parsley
1 teaspoon dried oregano
1/4 teaspoon salt
1/4 teaspoon coarsely ground black pepper
1 (10-ounce) package frozen chopped spinach, thawed, drained, and squeezed dry
1 large egg, lightly beaten
2 garlic cloves, crushed
5 (1 1/2-ounce) sourdough sandwich buns

To prepare aioli, combine first 5 ingredients in a food processor; pulse 1 minute or until smooth. Cover and chill.

Prepare grill or broiler.

To prepare the burgers, place onion slices on a grill rack or broiler pan coated with cooking spray, and cook 2 minutes on each side. Set aside.Combine the beef and the next 9 ingredients (beef through crushed garlic) in a large bowl. Divide the beef mixture into 5 equal portions, shaping each portion into a 1/2-inch-thick patty. Place patties on grill rack or broiler pan coated with cooking spray, and cook for 6 minutes on each side or until burgers are done.

Spread 1 1/2 tablespoons aioli over top half of each bun. Place patties on bottom halves of buns, and top each with 1 onion slice and top half of bun.