Step 1

Preheat the oven to 400 degrees F (200 degrees C). Line a baking sheet with aluminum foil and coat with cooking spray.

Step 2

Combine chicken, bread crumbs, egg, Buffalo sauce, garlic powder, onion powder, salt, and black pepper in a medium bowl.

Step 3

Spray hands with cooking spray to prevent sticking. Form a small portion of chicken mixture into a 1 1/2-inch ball around a cube of feta cheese and place onto the prepared baking sheet. Repeat with remaining chicken mixture and feta cubes.

Step 4

Bake in the preheated oven until cooked through, 18 to 20 minutes, turning over halfway through.

Step 5

Transfer cooked meatballs to a serving platter. Drizzle meatballs with Buffalo sauce and ranch dressing; sprinkle carrot, celery, and reserved feta cheese on top.