Preheat the oven to 350 degrees Fahrenheit. Grease an 8.5 x 4.5-inch pan with nonstick cooking spray and line with parchment paper. Set aside.
In a large bowl, add ½ cup melted butter, 1 ¼ cups sugar, and 3 eggs. Whisk until well combined.
Add 2 cups self-rising flour and 1 cup blueberries to the bowl, then stir until just combined.
Pour the batter into the prepared pan and bake for 55-60 minutes, or until a toothpick inserted into the center comes out clean. Cool completely before slicing.
Notes
Leftover & Make Ahead Instructions
Room Temperature: Store leftovers in an airtight container at room temperature for up to 3 days.
Freezer: Cool completely, then wrap tightly in plastic wrap and place in a freezer bag. Freeze whole or sliced for up to 3 months.
Make Ahead: Assemble the batter in the loaf pan, cover, and refrigerate for up to 24 hours before baking. Add about 5 minutes to the bake time.