Chicken Paprikash Recipe

Ingredients:
2 1/2 pounds chicken thighs and drumsticks
8 teaspoons sweet paprika, divided
3 tablespoons olive oil, divided
Kosher salt and freshly ground black pepper
2 medium onions, finely chopped (about 2 cups)
2 red bell peppers, seeded and sliced into 1/2-inch strips
3/4 cup homemade or store-bought low-sodium chicken stock, divided
1 tablespoon all-purpose flour
1 (14-ounce) can whole tomatoes, chopped with juice reserved (see note)
2 tablespoons sour cream
1 tablespoon chopped parsley