Irish Brown Bread

Ingredients

• 1 cup quick-cooking oats (not instant), such as McCann’s, plus extra for sprinkling
• 2 1/4 cups whole wheat flour, such as Heckers, or stone ground whole wheat
• 1/4 cup all-purpose flour
• 1/2 cup dark brown sugar, lightly packed. Could substitute molasses
• 2 1/4 teaspoons baking soda
• 1 teaspoon baking powder
• 2 teaspoons kosher salt
• 1 (11- to 12-ounce) bottle Guinness extra stout beer, at room temperature
• 1 cup buttermilk, shaken
• 5 tablespoons unsalted butter, melted, plus extra for brushing the pan
• 1 teaspoon pure vanilla extract
• Salted butter, such as Irish Kerrygold