Prep time: 40 minutes + 6 hours marinating
Cooking time: 45 minutes
With a small knife, cut a few slits in each drumstick. In a large hermetically sealed bag, mix the buttermilk, garlic, chilli powder, paprika, and salt. Marinate the drumsticks in the mixture for 4 to 6 hours in the refrigerator. Quickly drain the drumsticks before cooking.
Preheat the oven to 210° C (425° F).
Place the slices of bread on a baking sheet and dry them in the oven for 5 minutes. Then put them in a food processor and grind them into breadcrumbs. Mix in a large bowl with the rest of the ingredients.
Coat each of the drumsticks with breadcrumbs and place them on a baking sheet, ideally covered with a grill (or with lightly oiled aluminum foil). Cook for 40 minutes, turning halfway through the cooking time.