Heat a large skillet over medium-high heat for 1 minute.
Add the beef and break it up with a wooden spoon. Cook until browned, no pink remains and it reaches 71°C (160°F), about 6 minutes. Spoon off any fat.
Add the chili powder, cumin, smoked paprika, oregano, garlic powder, salt, tomato paste and 120 ml (1/2 cup) of water. Lower the heat to medium and simmer until saucy, about 4 minutes.
Warm the corn tortillas in a dry skillet over medium-high heat for 20 to 30 seconds per side, and keep them wrapped in a towel.
Shred the lettuce, dice the tomatoes and grate the cheddar.
Fill the tortillas with the beef, lettuce, tomato, cheese, Greek yogurt and salsa.
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