Preheat your oven to 375°F (190°C) and line a muffin tin with paper liners or lightly grease it.
In a large mixing bowl, whisk together the flour, sugar, baking powder, salt, and pea protein powder until evenly combined.
In a separate bowl, pour the plant-based milk, then add the oil and vanilla extract. Whisk until the mixture looks smooth and slightly frothy.
Pour the wet ingredients into the dry ingredients and gently fold together with a spatula until just combined. Be careful not to overmix, as this can make the muffins dense.
Fold in the blueberries gently, trying not to crush them so they stay juicy and visible in the batter.
Spoon the batter into the prepared muffin tin, filling each cup about 3/4 full to give room for rising.
Bake for 18-20 minutes until the muffins are golden on top, and a toothpick inserted in the center comes out clean.
Remove the muffins from the oven and let them cool in the tin for a few minutes before transferring to a wire rack to cool completely.
Enjoy these muffins while still slightly warm for the best juicy burst of blueberries and tender crumb.