Preheat the oven to 400°F. Line a baking sheet with parchment paper.
In a large bowl, combine the shredded chicken, refried beans, cheese, chili powder, cumin, garlic powder, onion powder, salt, and black pepper. Mix until well combined.
Warm the tortillas in the microwave for about 30 seconds to make them pliable.
Place about 1/3 cup of the chicken mixture in the center of each tortilla. Fold in the sides and roll up tightly to form a chimichanga.
Brush the tops of the chimichangas with olive oil and place them seam-side down on the prepared baking sheet.
Bake for 20-25 minutes, or until golden brown and crispy.
Serve with salsa, sour cream, and a sprinkle of fresh cilantro.