1 large onion, thinly sliced |
3 to 4 pounds bone-in chicken thighs |
two 6-ounce cans tomato paste |
two 4-ounce cans sliced mushrooms |
1 green bell pepper, seeded and finely chopped |
2 to 4 cloves garlic, minced |
2 teaspoons dried oregano |
1 tablespoon sweet paprika |
1 teaspoon dried basil |
1/2 teaspoon celery powder |
2 tablespoons brown sugar |
1 teaspoon salt, or more to taste |
1/2 cup dry white wine or chicken broth |
3 tablespoons olive oil |
1 teaspoon crushed red pepper (optional) |