Combine the ingredients for the chicken seasoning. Rub in the drumsticks with the seasoning until they're well-coated. Set aside.
Mince the 3 garlic cloves.
Preheat the oven to 200°C/400°F.
Heat olive oil in a large oven-proof skillet over medium high heat. Add drumsticks and sear both sides until golden brown, about 5 minutes per side. Transfer onto a clean plate. Remove excess oil, leaving the brown bits in the skillet.
Reduce heat to low, add butter, freshly ground black pepper and minced garlic. Stir until butter is melted and foaming, but not browned, about 2 minutes.
Deglaze white wine, cook until reduced and no raw alcohol aroma remains, about 3 minutes. Add chicken broth and mustard. Bring to a boil. Add half-and-half, stir in chickpeas and parmesan. Season with salt.
Return chicken to the skillet. Sprinkle with thyme and sage. Trim the top off the head of garlic to expose the tops and nestle upside-down between the chicken.
Place the skillet in the oven and roast until completely cooked through, about 30 minutes.
Squeeze out 2 or 3 roasted garlic cloves and add them to the sauce, smash with a fork. Enjoy!