Preheat your oven to 375°F (190°C) and lightly grease a small oven-safe baking dish.
Heat the olive oil in a medium skillet over medium-high heat. Add the diced chicken breast, red bell pepper, and yellow onion.
Sauté the mixture for 6-8 minutes until the chicken is cooked through and the vegetables are tender. Season with sea salt, black pepper, and garlic powder.
In a small mixing bowl, whisk together the plain Greek yogurt and 2 tablespoons of the red enchilada sauce until a creamy, uniform sauce forms.
Warm the corn tortillas in a dry pan or microwave for 10 seconds to make them pliable.
Spread half of the yogurt sauce onto each tortilla, top with the sautéed chicken and vegetable mixture, and roll them up tightly.
Place the rolled tortillas seam-side down in the baking dish. Pour the remaining red enchilada sauce over the top and sprinkle evenly with shredded Monterey Jack cheese.
Bake for 15 minutes until the cheese is melted and the sauce is bubbling around the edges.
Remove from the oven and garnish with freshly chopped cilantro before serving warm.