Combine milk, butter, vanilla, and orange juice in a small saucepan. Simmer on medium-low heat until the butter has just melted. Remove from heat and allow to cool for a few minutes.
Transfer the mixture into a mixing bowl and whisk in one egg at a time
Sift flour into a separate mixing bowl. Add baking powder, salt, and sugar.
Combine wet ingredients and dry ingredients. Use an electric mixer and beat until well blended.
Use a spatula to fold blueberries into the batter. Fill each muffin tin with about ½ cup of batter.
Place muffin tin on medium rack and bake for 20-22 minutes at 400º Fahrenheit. Use a wooden toothpick to check for doneness.