Preheat your oven to 375°F (190°C).
Heat olive oil in a pan and sauté onion, garlic, and bell pepper until soft.
Stir in black beans, corn, cumin, chilli powder, salt, and pepper. Cook for 5 minutes.
Mix the sautéed vegetables with shredded chicken in a large bowl.
Spread a spoonful of enchilada sauce on each tortilla, fill with chicken mixture, and roll tightly.
Place rolled tortillas seam-side down in a baking dish.
Whisk together Greek yogurt and remaining enchilada sauce, then pour over tortillas.
Sprinkle shredded cheese evenly on top.
Bake uncovered for 25 minutes or until golden and bubbly.
Garnish with fresh cilantro before serving.