1. Preheat the Oven and Prepare the Pan: Start by preheating your oven to 400 F (200 C). Line a large baking sheet with parchment paper or aluminum foil for easy cleanup.

2. Prepare the Chicken: Pat the chicken breasts or thighs dry with paper towels. If your chicken breasts are very thick, you might want to slice them horizontally to create thinner cutlets, ensuring more even cooking.

3. Season the Chicken: In a medium bowl, combine the olive oil, garlic powder, onion powder, paprika, dried oregano, salt, and black pepper. Add the chicken pieces to the bowl and toss them thoroughly until each piece is evenly coated with the spice mixture.

4. Arrange on Baking Sheet: Place the seasoned chicken in a single layer on the prepared baking sheet. Ensure there’s a little space between each piece so they can roast rather than steam.

5. Bake Until Cooked Through: Bake for 20-25 minutes, or until the internal temperature of the thickest part of the chicken reaches 165 F (74 C).

6. Rest the Chicken: Once cooked, remove the baking sheet from the oven and tent it loosely with aluminum foil. Let the chicken rest for 5-10 minutes.

7. Cool and Prepare for Storage: After resting, slice, dice, or shred the chicken according to your preference for meal prep. Allow it to cool completely to room temperature before transferring it to airtight containers for storage.