Preheat the oven: Set your oven to 350°F. Line a baking sheet with parchment paper or lightly grease it with cooking spray.
Prepare the chicken: Pat the chicken tenderloins dry with paper towels and place them in a large bowl.
Season the chicken: Drizzle the olive oil over the tenderloins. In a small bowl, mix the garlic powder, paprika, onion powder, dried oregano, salt, and black pepper. Sprinkle the seasoning blend over the chicken, ensuring each piece is evenly coated.
Arrange on the sheet pan: Lay the chicken tenderloins in a single layer on the prepared baking sheet. Ensure they are not overlapping for even cooking.
Bake: Place the sheet pan in the preheated oven and bake for 18-25 minutes, or until the internal temperature of the chicken reaches 165°F (74°C). For a slight char, you can broil the chicken for the last 2-5 minutes.
Serve: Remove the chicken from the oven and let it rest for 5 minutes. Garnish with fresh parsley if desired and serve with your favorite sides.