Preheat oven to 350 degrees F and prepare a loaf pan with baking spray or butter.
In a large bowl combine flour, baking powder, salt and lemon zest. In a small bowl place blueberries and 1 tablespoon of flour, stir to coat blueberries. Set both mixtures aside.
In mixing bowl, or in the bowl attached to a stand mixer, combine butter and sugar until mixture looks fluffy. Add eggs, one at a time, and vanilla extract.
While mixer is running, alternate between adding flour mixture and milk, scraping down the sides of the bowl as you go. Turn off the mixer, and fold ¾ of the blueberries to mixing bowl and blend by hand.
Pour batter into prepared loaf pan and top with remaining blueberries. Place in oven for one hour and bake until a cake tester or toothpick inserted in the center emerges clean.
Serve immediately, or save for 3-5 days in an airtight container.
Recipe by In Good Taste at http://ingoodtaste.kitchen/blueberry-lemon-cake/