Trim off excess skin and fat from the chicken thighs. Season with salt and pepper and coat with flour.
Heat 2 Tablespoons olive oil in a large heavy pan, like a Dutch oven, over medium heat. Working in batches, place the chicken thighs in the pan, skin side up. Cook about 5 minutes on each side until crispy. Place on a plate and set aside.
Add the bell peppers and onions to the pan and saute until tender, about 5 minutes (if needed, heat 2 more tablespoons of olive oil before adding the bell peppers and onions). Add the garlic and saute for another 2 minutes. Add the white wine and deglaze the pan by scraping the bottom. Simmer until the wine is reduced by half.
Add the diced tomatoes and tomato sauce. Season with salt and pepper. Continue cooking until the sauce is heated.
Return the chicken to the pan and cover with the sauce. Reduce the heat to medium-low and simmer until the chicken is cooked through, about 30 minutes. Test with a meat thermometer.
Garnish with torn fresh basil leaves.
Chicken Thighs - I love using chicken thighs, but legs will work great as well. My father would make his with both legs and thighs.
Bell Peppers - I like colorful dishes so I like to use a combination of green, red, and yellow. Use whichever color or colors you like.
Sweet Onions - sweet onions are my goto because they are so flavorful. Yellow onions will work great as well.
White Wine - I use chardonnay, but you can use a blanc or pinot grigio as well.
Tomato Sauce - I use my own homemade Best Homemade Tomato Sauce Recipe. I have tried using store bought, but there is nothing that comes close to homemade. You can use your favorite tomato sauce.