- Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper. 
- In a large bowl, combine the shredded chicken, black beans, corn, cheese, cumin, chili powder, garlic powder, onion powder, salt, and pepper. Mix well until all ingredients are evenly incorporated. 
- Place a tortilla on a flat surface. Spoon about 1/2 cup of the chicken mixture onto the center of the tortilla. Fold in the sides and roll it up tightly. Repeat with the remaining tortillas and filling. 
- Place the rolled chimichangas seam-side down on the prepared baking sheet. Brush the tops lightly with olive oil. 
- Bake in the preheated oven for 20-25 minutes, or until the chimichangas are golden brown and crispy. 
- Serve hot with salsa and sour cream on the side. Garnish with fresh cilantro if desired.