Preheat oven to 350 °F.
In a medium sized bowl whisk together the flour, baking powder, baking soda and salt. Set aside.
2¾ cups all-purpose flour, 1 tsp baking powder, ½ tsp baking soda, ½ tsp salt
In a small bowl, combine the lemon zest with the sugar and use your fingers to rub the two together. This will help release the fragrant oils from the lemon zest and will give the sugar a nice, light yellow hue.
2 tbsp grated lemon zest, tightly packed, 1½ cups granulated sugar
In the bowl of a stand mixer, beat the eggs together with the sugar and zest. Beat for 5 minutes and then slowly pour in the lemon juice, milk and the olive oil.
3 large eggs, ¾ cup lemon juice, ¼ cup milk, 1 cup olive oil
With the mixer on low, slowly add in the flour mixture, leave behind about 1/4 cup of the flour. Add the FROZEN blueberries to this 1/4 cup of flour and toss to coat. Once the flour in the mixing bowl has been well incorporated with the wet ingredients, add in the flour coated blueberries. Mix only until incorporated; do not over mix because doing so might crush your blueberries. Alternatively, you can add and mix in the blueberries by hand using a rubber spatula. IF YOU'RE USING FRESH BLUEBERRIES, PLEASE SEE DIRECTIONS BELOW.
2 cups blueberries
FROZEN BERRIES: Grease a bundt pan with cooking spray or vegetable oil. Pour in the batter and then use a knife to swirl the batter a bit, in order to help distribute the blueberries evenly.
IF USING FRESH BERRIES... With the mixer on low, slowly add in the flour to the egg and sugar mixture; leave behind about 2 tablespoons of the flour. Add the fresh berries to the 2 tablespoons of flour, toss to coat them and keep aside. Spoon one-third of the batter evenly into the prepared bundt pan. Sprinkle in half of the blueberries, then top with another one-third of the batter. Scatter the remaining blueberries on top and cover with the rest of the batter; smooth the top.
Bake on the middle rack of your oven for approximately 60 - 70 minutes or until a toothpick inserted into the cake comes out clean.
Allow the cake to cool in the bundt pan for approximately 15-20 minutes before removing it. Set it to cool on a baking rack.
Enjoy!