Preheat oven to 425° and line a large baking sheet with parchment paper.
In a medium sauce pan over medium heat, combine ketchup, Dr. Pepper, tomato paste, Worcestershire sauce and onion powder. Whisk to combine and bring to a simmer. Cook until thickened slightly, 4 to 6 minutes. Season with salt and pepper.
Place drumsticks in a large bowl and season generously with salt and pepper. Pour about ¾ the marinade over the chicken and toss to coat. Place chicken in a single layer on prepared baking sheet and bake 30 to 35 minutes. Remove from oven and set oven broiler to high. Brush chicken with remaining sauce and place under broiler until golden and crisp, 3 to 5 minutes.
Remove from oven and let cool slightly then serve.
Recipe by Cooking TV Recipes at https://cookingtv-channel.com/dr-pepper-chicken/