Heat the olive oil in a large sauté pan over medium-high heat. When it is hot, add the bay leaf, garlic, crushed red pepper and red onion. Cook until the onion begins to wilt and the garlic begins to turn golden around the edges, 3 to 4 minutes. Add the kale, salt and pepper, and cook for another 2 minutes. Then add the white beans, tomatoes and stock. Cover and cook until the kale is wilted and cooked through, about 15 minutes. Taste and adjust the seasoning if necessary.