Preheat & Prep: Preheat oven to 350°F (175°C). Grease or line your 8" cake pan.
Mix Dry Ingredients: In a bowl, whisk together flour, baking powder, baking soda, and salt.
Blend Wet Ingredients: In a separate large bowl, whisk egg, sugar, yogurt, milk, oil, vanilla, lemon juice, and lemon zest until smooth.
Combine: Gently fold the dry ingredients into the wet mixture. Don’t overmix—just until no streaks remain.
Add Blueberries: Toss blueberries in a bit of flour (to prevent sinking) and fold into the batter.
Bake: Pour batter into your prepared pan. Bake for 30–35 minutes, or until a toothpick comes out clean.
Cool & Glaze (Optional): Let the cake cool in the pan for 10 minutes, then transfer to a rack. Dust with powdered sugar or drizzle with lemon glaze if desired.