Prep your ingredients: Slice the ring sausage into 1/2-inch rounds. Slice onion and bell peppers into strips.
Halve small potatoes (or rinse and drain your beans). Mince garlic.
Start the potatoes: Heat 1 tablespoon olive oil in a large skillet over medium heat. Add potatoes with a pinch of salt and cook 7–9 minutes, stirring a few times, until starting to brown and soften.
If using beans instead of potatoes, skip to Step 3.
Brown the sausage: Push potatoes to one side (or start with an empty pan if using beans). Add remaining 1 tablespoon olive oil and the sliced sausage. Cook 3–4 minutes, flipping once, until caramelized on the edges.
Browning builds flavor fast.
Add the vegetables: Add onion, bell peppers, and a pinch of salt. Cook 4–5 minutes until softened and a bit glossy. If using beans, add them now.
Stir in garlic and cook 30 seconds until fragrant.
Season it: Sprinkle smoked paprika, oregano, and several grinds of black pepper over everything. Toss to coat. Add cherry tomatoes if using; let them blister for 1–2 minutes.
Make a quick pan sauce: Pour in broth, then whisk in Dijon mustard directly in the pan.
Scrape up browned bits from the bottom—they’re flavor gold. Simmer 2–3 minutes to slightly thicken.
Finish bright: Turn off heat. Stir in apple cider vinegar or a squeeze of lemon.
Taste and adjust salt and pepper. If you like heat, add a pinch of red pepper flakes.
Serve your way: Sprinkle with chopped parsley or green onions. Eat straight from the skillet, or spoon over rice, crusty bread, or cauliflower rice.