Preheat oven to 375-degrees Fahrenheit (190 degree Celsius)
Add the softened butter and granulated sugar to a large bowl, and use a hand mixer (or stand mixer to light cream them together.
Add the lemon zest to the bowl along with the eggs (one at a time), along with the vanilla extract.
Blend until creamy.
Sift the dry ingredients (flour, baking powder, salt) and add them (in increments), alternating with the milk, into the large bowl and the creamed butter and egg mixture.
Blend until smooth.
Add ½ cup of the fresh blueberries to a small bowl and use a pastry blender or fork to smash the berries lightly.
Gently fold the mashed berries into the batter.
Toss the remaining fresh whole blueberries with 1 tablespoon of flour and then gently fold the whole berries into the muffin batter.
Use a large muffin or cookie scoop to add the blueberry muffin mix into the muffin tins (that have been sprayed with baking spray) to ¾'s full.
Bake the muffins until golden brown and when a toothpick or skewer comes out clean when inserted into the center of the muffins.
Cool completely on a wire rack.
Notes
Store muffins in a airtight container at room temperature for up to 2 days.Store muffins in an airtight container in the refrigerator for up to 5 days.May be frozen. Store muffins in an airtight container or freezer bag for up to 3 months.