01 -
In a large measuring cup, whisk the brown gravy mix with 240 ml cold water until smooth. Stir in tomato sauce, Italian seasoning, parsley, mustard powder, and salt. Set aside.
02 -
Cut chicken breasts into evenly sized cubes. Season with salt and pepper. Sprinkle with flour and gently toss to coat all sides evenly.
03 -
Heat olive oil in a large skillet over medium-high heat. Add chicken and cook for 3–4 minutes, turning to brown on all sides. Continue cooking for an additional 3 minutes, or until chicken is just cooked through. Remove chicken from the skillet and set aside.
04 -
Turn off heat and pour in 60 ml of the wine (or broth). Set heat to medium and use a silicone spatula to scrape and loosen any browned bits from the bottom and sides of the skillet.
05 -
Add butter to the pan with the sliced onions. Cook on medium heat, stirring often, for approximately 20 minutes until onions become very soft and nearly caramelized.
06 -
Add minced garlic to the onions and cook for 1 minute, until fragrant.
07 -
Pour in the remaining wine (or broth) and simmer for 5 minutes to reduce the liquid slightly.
08 -
Stir in the prepared gravy and tomato mixture. Bring to a gentle boil to thicken for about 30 seconds, then reduce heat to a simmer. Return the cooked chicken cubes to the pan.
09 -
Partially cover the skillet. Meanwhile, in a large pot, bring water to a boil for the spaghetti. Add 1/4 tablespoon salt. Boil spaghetti until al dente according to packet instructions. Drain well.
10 -
Add drained spaghetti to the skillet, tossing gently to thoroughly coat pasta in the sauce. Garnish with chopped parsley and serve immediately.