Preheat oven to 375°F (190°C). Line a 12-cup muffin tin with paper liners.
In a large bowl, whisk together the flour, sugar, baking powder, and salt.
In a separate bowl, whisk the oil, egg, milk, and vanilla.
Pour the wet ingredients into the dry ingredients. Stir until just combined — the batter should still be slightly lumpy.
Gently fold in the blueberries.
Divide batter evenly among the 12 muffin cups (about 2/3 full each).
Bake for 20–24 minutes until the tops are golden and a toothpick comes out clean.
Cool in the pan for 5 minutes, then transfer to a wire rack.
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