1. Preheat oven to 375°F (190°C). Season chicken thighs with salt, pepper, and smoked paprika.
2. Heat olive oil in a large skillet over medium-high heat. Sear chicken thighs, skin-side down, until golden and crispy (about 4 minutes). Flip and cook for another 3 minutes. Remove from heat and place on a baking sheet.
3. In a small bowl, whisk honey, Dijon mustard, whole-grain mustard, and garlic. Brush the glaze generously over the chicken thighs.
4. Bake for 20-25 minutes, or until the chicken is fully cooked (internal temperature of 165°F).
5. Remove from the oven, sprinkle mozzarella cheese over each thigh, and broil for 2-3 minutes, until the cheese is melted and bubbly.
6. Garnish with parsley and red chili flakes before serving.