Preheat your oven to 375°F (190°C).
In a skillet over medium heat, add the olive oil, diced bell pepper, and onion. Sauté until softened, about 5 minutes.
Add the chicken breast to the skillet, season with chili powder, cumin, sea salt, and black pepper. Cook until the chicken is fully opaque, then shred using two forks.
In a small bowl, whisk together the Greek yogurt, salsa verde, and lime juice to create the creamy sauce.
Toss the shredded chicken and sautéed vegetables with half of the creamy sauce mixture.
Warm the corn tortillas slightly to prevent cracking, then fill each with the chicken mixture and roll tightly.
Place the rolled tortillas seam-side down in a small baking dish. Top with the remaining creamy sauce and sprinkle with Monterey Jack cheese.
Bake for 12-15 minutes until the cheese is bubbly and the edges of the tortillas are slightly crisp.