Prep the Chicken
Pat chicken thighs dry.
Season both sides and under the skin with salt and pepper.
Brown the Chicken
Heat olive oil in a large pan or braiser over medium-high.
Place chicken skin-side down and sear until golden brown. Flip and brown the other side (about 8 minutes total).
Remove chicken and set aside.
Sauté the Vegetables
In the same pan, add onion, celery, red and green peppers, mushrooms, and garlic.
Season with salt, pepper, oregano, thyme, parsley, and red pepper flakes.
Cook 5–6 minutes, stirring often, until softened.
Deglaze and Simmer
Pour in the red wine and simmer until reduced by half.
Stir in crushed tomatoes and cook 5–10 minutes over medium heat.
Add Chicken and Braise
Nestle chicken thighs into the sauce.
Reduce heat to medium-low, cover, and simmer 30 minutes, until chicken is tender and fully cooked.
Finish and Serve
Garnish with fresh parsley.
Serve warm over pasta, polenta, or with crusty bread.