Preheat oven to 375℉ and line a muffin pan with muffin papers or grease the cups.
In a large bowl, whisk together egg, oil, milk, and vanilla extract.
Stir in sugar until well blended.
Add flour, cinnamon, and baking powder. Stir until almost combined.
Fold in zucchini and blueberries.
Fill muffin pan evenly with batter, about ¼-⅓ cup of batter per section.
Bake for 20-22 minutes or until just baked through.
Allow to cool in pan for 3-4 minutes before removing to a cooling rack.
Serve warm or at room temperature.
Store in an air-tight container for up to 3 days.