Heat the olive oil in a large cast-iron skillet over medium-high heat until shimmering.
Add the lamb sausage links and sear for 5-7 minutes, turning occasionally until browned and cooked through.
Remove the sausage from the skillet and set aside on a plate.
In the same pan, add the sliced bell peppers and red onion, sautéing for 5 minutes until they begin to soften and char.
Stir in the minced garlic, dried oregano, sea salt, and black pepper, cooking for 1 minute until fragrant.
Add the rinsed cannellini beans to the skillet, stirring gently to combine with the peppers and absorb the pan juices.
Slice the lamb sausage into rounds and return them to the skillet, tossing everything together.
Garnish with freshly chopped parsley and serve immediately.