Chunky Banana Bran Muffins

Name: Chunky Banana Bran Muffins
Ingredients: 1 cup unprocessed wheat bran; 1 cup buttermilk (shaken); 4 tablespoons unsalted butter, at room temperature; 1/4 cup light brown sugar, lightly packed; 2 extra-large eggs, at room temperature; 6 tablespoons unsulphured molasses; 1 teaspoon grated orange zest; 1/2 teaspoon pure vanilla extract; 1 1/2 cups all-purpose flour; 3/4 teaspoon baking powder; 1/4 teaspoon baking soda; 1/2 teaspoon kosher salt; 1 cup raisins; 1 cup large-diced bananas; 1/2 cup chopped walnuts