Heat 1 tsp of olive oil in a skillet over medium heat.
Add diced onion and bell pepper, sauté until softened for 3-4 minutes.
Stir in minced garlic, cooking for another minute.
Add 1 lb of lean ground turkey (or chicken) to the skillet, cooking until browned for 5-7 minutes.
Stir in 1 cup each of black beans and corn along with 1 tbsp of taco seasoning, heating through for another 5-7 minutes.
Warm 8 small corn tortillas in a dry skillet or microwave until pliable and slightly golden.
Layer generous amounts of the filling onto each tortilla.
Top with shredded lettuce, diced tomatoes, avocado slices, and a dollop of Greek yogurt.