Preheat the oven to 375°F. In a small measuring cup or bowl combine all of the chicken seasoning ingredients (olive oil, Adobo seasoning, Italian seasoning, smoked paprika, onion powder, salt, and black pepper). Mix well and set the seasoning mixture to the side.
Now clean the chicken and remove any excess fat or small feathers that may still be on the chicken legs. Pat the chicken dry with a paper towel.
Add the chicken legs to a large bowl. Add the seasoning mixture on top of the chicken. Rub the seasoning all over the chicken with your hands until the chicken legs are coated really well.
Next, coat the bottom of a 9x13-inch baking dish with butter. Add the seasoned chicken legs to the baking dish. Then add the sliced onion and bell pepper around the chicken in the dish.
Now mix the flour and chicken broth together until the flour is completely dissolved. Pour the chicken broth inside the bottom of the baking dish. Do not pour the broth over the chicken legs, just pour it in the bottom around the chicken.
Cover the baking dish with aluminum foil and bake in the preheated oven for 45 minutes. After 45 minutes, carefully remove the foil, baste the chicken legs with the broth, then place the baking dish back in the oven uncovered for another 30 minutes.
Once the chicken is done, feel free to baste it again with the flavorful broth. Serve hot with mashed potatoes, rice, or your favorite side dish and enjoy!