INGREDIENTS
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1/2 cup (2 ounces) crumbled feta cheese
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2 tablespoons light mayonnaise
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2 tablespoons plain fat-free yogurt
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1/4 teaspoon coarsely ground black pepper
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1 garlic clove, minced
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5 (1/2-inch-thick) slices red onion
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Cooking spray
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1 pound lean ground round
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2/3 cup fresh breadcrumbs
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1/3 cup chopped bottled roasted red bell peppers
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1/4 cup chopped fresh parsley
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1 teaspoon dried oregano
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1/4 teaspoon salt
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1/4 teaspoon coarsely ground black pepper
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1 (10-ounce) package frozen chopped spinach, thawed, drained, and squeezed dry
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1 large egg, lightly beaten
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2 garlic cloves, crushed
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5 (1 1/2-ounce) sourdough sandwich buns