Preheat the oven to 350 degrees F. Spray 10 wells of a muffin pan with cooking spray. In a large bowl, stir together the almond flour, swerve, flaxseed meal, and baking powder.
Mix in the avocado oil, almond milk, eggs, vanilla and lemon zest until batter is smooth.
Gently fold in blueberries.
Distribute the batter evenly among the muffin wells. Bake for 20-25 minutes, until the tops are slightly golden.
Store muffins on the countertop, covered, and enjoy within 2 days. You can also store in the fridge in an airtight container for up to a week.