Preheat oven to 400°F. Line a 12-cup muffin tin or grease cups. (I personally prefer greased cups).
Make the flax egg: mix ground flaxseed + water; set 5 minutes.
1 large flax egg
In a large bowl, whisk flour, baking powder, baking soda, salt, and cinnamon (optional).
1.5 cups cup all-purpose flour, 1 cup old fashioned oats, 1 tsp baking powder, 1/2 tsp baking soda, 1/2 tsp fine sea salt, 1/2 tsp ground cinnamon
In a separate bowl, whisk plant milk, yogurt, maple syrup, oil, vanilla, lemon zest (optional) and flax egg until smooth. Make sure to thoroughly blend the yogurt until the clumps are fairly smooth.
3/4 cup plant milk, 5.3 oz vanilla Greek-style yogurt cup , 1/3 cup maple syrup, 1/3 cup canola oil, 1 tsp vanilla extract, 1-2 tsp lemon zest
Pour wet into dry and gently fold until just combined. Let it sit for 10 minutes.
Toss frozen wild blueberries with flour. Fold blueberries into batter, just enough to combine. Avoid over mixing.
1 1/2 cups frozen wild blueberries
Divide batter among muffin cups (about 3/4 full). Batter should make somewhere between 10-12 muffins, depending on how much batter you add to each cup.
Bake 20–25 minutes, until a toothpick comes out clean and golden on top.
Cool in pan 5–10 minutes, then transfer to a rack. Enjoy!