Heat the olive oil in a large skillet over medium-high heat. Add the lamb cubes and brown them on all sides, about 5 minutes total. Transfer the meat to the slow cooker.
In the same skillet, cook the onion and garlic for 3 minutes until softened. Stir in the smoked paprika and cook for 30 seconds more to release its flavor.
Add the onion mixture to the slow cooker along with the sliced bell peppers, beef broth, salt, and black pepper. Stir to combine.
Cover and cook on low for 7 hours. In the last hour, stir in the white beans so they warm through without breaking apart.
Taste and adjust salt if needed. Sprinkle with fresh parsley before serving.