Preheat the pan. Heat a large skillet over medium-high. Add 1 tablespoon of olive oil. You want it shimmering—this is how you get that golden, “I actually seared this” flavor.
Brown the sausage. Add sliced sausage in a single layer. Cook 3–4 minutes per side until nicely browned. Remove to a plate. Don't wipe the pan—those browned bits are flavor gold.
Sauté the firm veggies. Add the remaining 1 tablespoon oil. Toss in onion, broccoli, and bell peppers. Cook 5–6 minutes, stirring occasionally, until the edges char slightly and the broccoli softens.
Add tender veggies and aromatics. Stir in zucchini and garlic. Cook 2–3 minutes until zucchini is just tender and garlic smells incredible (scientific term).
Season like you mean it. Sprinkle in smoked paprika, oregano, red pepper flakes, salt, and black pepper. Stir to coat. Return sausage and any juices to the pan.
Make it glossy. Whisk soy sauce, Dijon mustard, and lemon juice together. Pour over the skillet and toss. Cook 1–2 minutes until everything is shiny and lightly sauced.
Finish and serve. Taste and adjust salt or acidity. Garnish with chopped parsley or green onions. Serve as is, or over rice, quinoa, cauliflower rice, or stuffed into warm tortillas.