01 - Preheat oven to 350°F. Grease a 9x5-inch loaf pan or line with parchment paper.
02 - In a large mixing bowl, whisk together all-purpose flour, granulated sugar, baking powder, and fine sea salt until evenly distributed.
03 - Pour beer into the dry ingredients and stir using a wooden spoon or spatula until just combined into a shaggy batter, avoiding overmixing.
04 - Scrape the batter into the prepared loaf pan and smooth the surface for even baking.
05 - Drizzle melted butter evenly over the batter for enhanced flavor and a golden crust, if desired.
06 - Place pan in oven and bake for 45 to 55 minutes, until the loaf is golden brown and a toothpick inserted into the center comes out clean.
07 - Let loaf cool in pan for 10 minutes. Transfer to a wire rack to cool completely before slicing.