Preheat oven to 375 degrees F. Line a muffin tin with muffin liners.
In a medium bowl, add flour, flax, baking soda, baking powder, and salt and mix together well.
In a separate medium bowl, whisk together oil and sugar. Add eggs and milk and whisk together well. Add vanilla and yogurt and mix together to incorporate well.
Add dry ingredients to wet ingredients and mix together, being careful not to overmix the batter. Gently fold in blueberries.
Scoop a heaping ¼ cup of batter into each muffin tin.
Bake for 20 to 25 minutes until golden brown.
Cool on a rack before serving.