How to Make It
Combine ground round, 2 tablespoons onion, and 2 tablespoons chili powder; shape into 6 (1/2-inch-thick) patties.
Coat a large nonstick skillet with cooking spray; place over medium-high heat until hot. Add patties; cook 4 minutes on each side or until done.
While burgers cook, combine remaining onion, tomato, 1 teaspoon chili powder, and lime juice. Place patties on bottom halves of buns; spoon salsa over patties, and cover with bun tops.
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