Heat olive oil in a large skillet over medium heat. Add diced onion and bell pepper, cooking until softened, about 3-4 minutes.
Add minced garlic and cook for another 30 seconds until fragrant.
Add ground turkey or chicken sausage to the pan, breaking it up with a spatula. Cook until browned and no longer pink, about 5-6 minutes.
Stir in black beans, chili powder, cumin, salt, and pepper. Cook for 2 minutes to warm through.
In a separate bowl, whisk eggs until well combined. In another skillet, scramble the eggs until just set but still slightly moist.
Warm tortillas in the microwave or in a dry skillet.
Assemble tacos by dividing the meat mixture, scrambled eggs, and cheese among the tortillas.
Top with your favorite toppings and serve immediately.