Preheat your oven to 375°F (190°C) and line a muffin tin with paper liners.
In a large bowl, whisk together flour, sugar, baking powder, baking soda, and salt.
In another bowl, mix the oil, egg, and milk until well combined.
Add the wet ingredients to the dry ingredients and stir until just combined.
Gently fold in the lemon zest and blueberries.
Fill each muffin cup about two-thirds full with batter.
Bake in the preheated oven for 18-20 minutes, or until a toothpick comes out clean.
Let the muffins cool in the tin for 5 minutes, then transfer to a wire rack.
Enjoy warm or at room temperature!
Store leftovers in an airtight container.