Step 1

Heat oil in large nonstick skillet over medium-high heat.

Step 2

Add bell peppers and onion; cook, stirring occasionally, for 5 to 6 minutes, or until onion is translucent and peppers are tender.

Step 3

Add garlic; cook, stirring frequently, for 1 minute.

Step 4

Add beef, chili powder, cumin, pepper flakes, and salt; cook, stirring occasionally, for 7 to 8 minutes, or until meat is no longer pink.

Step 5

Add salsa; cook, stirring frequently, for 2 to 3 minutes, or until heated through.

Step 6

Evenly top each tortilla with beef mixture, yogurt, cilantro, and a squeeze of lime juice.