Preheat the oven to 350°F (177°C). In a small bowl, make the flax eggs: whisk 2 tablespoons of ground flax with 4 tablespoons of water, and let sit for 5 minutes to thicken.
Combine the dry ingredients. Place 2 cups rolled oats and the walnuts in a food processor or high-speed blender. Pulse until the mixture forms a fine meal. Transfer to a medium bowl and whisk in the remaining ½ cup rolled oats, coconut sugar, baking powder, baking soda, and salt.
Combine the wet ingredients. In a separate, large bowl, mash the bananas with a fork, then add in the non-dairy milk, tahini, flax eggs, vanilla extract, and lemon juice. Stir to combine.
Incorporate the dry mixture into the wet mixture, folding just until all there are no more clumps. Fold in the chocolate chips. Divide the batter evenly into a 12-cup muffin tin (either greased or lined with parchment paper cups).
Bake in the oven for 20-25 minutes until the tops of the muffins are golden brown, or when an inserted toothpick comes out cleanly. Let sit for 10 minutes before removing from pan, then cool on a wire rack before serving.
Notes
You can also use ready-made oat flour.
If allergic to nuts, substitute toasted sunflower seeds.
*The sweetness will depend on your bananas. I’ve found that if my bananas are not very ripe, adding the extra 2 tbsp of sugar is necessary.
Blueberry muffin variation: use one heaping cup fresh blueberries in place of the chocolate chips.