Chicken with Roasted Peppers

Name: Chicken with Roasted Peppers
Ingredients: 6 whole chicken legs with thighs; Coarse salt and freshly ground black pepper to taste; 3 tablespoons olive oil; 3 tablespoons unsalted butter; 2 medium onions, thinly sliced; 1 teaspoon coarse salt; 1 teaspoon freshly ground black pepper; 2 garlic cloves, minced; 1 teaspoon paprika; 2 red bell peppers, roasted, peeled, seeded and chopped; 2 yellow bell peppers, roasted, peeled, seeded and chopped; 2 poblano chiles, roasted, peeled, seeded and chopped; 1 tomato, peeled, seeded and diced; 1 1/4 cups chicken stock