Preheat oven to 375. Prepare a muffin tin with paper cups
Combine dry ingredients except for blueberries. Whisk to combine.
Cream butter and sugar in a separate bowl until fluffy. Add the eggs and again whip until fluffy. Add remaining wet ingredients and combine until well mixed.
Add 3/4 of the dry mixture to the wet ingredients. Gently combine until the flour disappears.
Add the remaining dry mixture to the blueberries and toss to coat.
Add the flour-coated blueberries to the batter and gently combine.
Divide the batter into the muffin cups.
Bake for 30 minutes and test with a toothpick or fork to make sure they are done.
While the muffins bake, prepare the lemon drizzle by combining the lemon juice, powdered sugar, and salt and whisk until well combined and smooth.
When the muffins are finished, top the muffins with the lemon drizzle while still in the muffin pan. Remove the muffins and allow them to cool slightly before eating.
Note: muffins should be eaten within 3-4 hours after baking or frozen for future use.