Melt 1 tablespoon butter with 1 tablespoon oil in a large skillet over medium heat.
Add minced shallot and garlic; cook, stirring often, until softened, about 2 minutes.
Add 1½ teaspoons pepper; cook, stirring constantly, until fragrant, 1 to 2 minutes.
Stir in 2 cups broth and ¼ teaspoon salt; bring to a boil over medium-high heat.
Add rinsed beans; cook, stirring occasionally, until heated through, about 2 minutes.
Divide the bean mixture among 4 bowls.
Sprinkle with ½ cup Pecorino and drizzle with the remaining 2 tablespoons oil.
Garnish with additional pepper and/or parsley, if desired.
Serve with toasted baguette slices.
