Preheat oven to 375 degrees.
Grease an 8x4 inch loaf pan with butter or melted coconut oil, or line the pan with parchment paper for easeir removal.
In large bowl, combine melted butter and sugar and beat until smooth.
Add eggs and beat until well blended.
Add lemon juice, lemon zest, and milk. Mix again until batter is smooth.
Combine dry ingredients (gluten free flour, baking powder, and salt) and then add to batter. Beat until batter is very smooth.
Fold in blueberries, but make sure to save a few to put on top! Gotta make sure it's pretty, right?
Pour batter into loaf pan and bake for about 40 minutes. Toothpick inserted in center should come out smooth, and sides should begin to pull away from sides. Top will be golden and cracked.
Let cool for way longer than you want to wait. Trust me on this.