Heat olive oil in a large skillet over medium-high heat.
Brown the sausage on all sides until deeply golden. Transfer to a board.
Slice the browned sausages into thick pieces on a bias.
Add onions and peppers to the skillet with a pinch of salt. Cook until softened and lightly caramelized.
Stir in garlic and red pepper flakes. Cook 30 seconds until fragrant.
Pour in chicken broth and scrape up browned bits with a spoon.
Add crushed tomatoes, Italian seasoning, black pepper, and remaining salt. Return sausage to the pan.
Simmer gently until the sauce thickens and sausage is cooked through, about 10 minutes.
Finish with balsamic vinegar and parsley. Taste and adjust seasoning, then serve hot.
Notes
Variation: Add a pinch of fennel seeds with the garlic, or swap in turkey sausage for a lighter take. Serving tip: Spoon over creamy polenta, toss with cooked pasta, or pile into toasted hoagie rolls with melted provolone. Storage: Refrigerate up to 4 days; reheat gently with a splash of broth.This recipe is an original creation inspired by classic Sausage Peppers and Onions Delight flavors. All ingredient ratios and instructions are independently developed.