Tip: do this step up to a few days in advance to save time! Preheat the oven to 400 degrees F/204 degrees C. Scrub 2 medium sweet potatoes, use a fork to poke holes all over, and place them on a lined baking sheet. Bake on the center rack for 45 to 60 minutes or until cooked through. Slice open to cool, remove the flesh, and transfer to a mixing bowl.
Change the oven heat to 350 degrees F/177 degrees C. Generously grease a muffin tray, or better yet use a silicone muffin tray if you have one, and set aside.
Mash the sweet potato flesh in the bowl, then whisk in the eggs, melted coconut oil, maple syrup, and vanilla.
Use a high-powered blender or food processor to grind the oats into a flour (or sub store-bought oat flour). Transfer to another bowl, and mix in the rest of the dry ingredients (baking soda, cinnamon, salt, milled flaxseed). Add the dry ingredients to the sweet potato mixture, and use a spatula to mix until well combined. Fold in the blueberries.
Transfer the batter to the muffin tray. Fill each cavity as close to the top as possible (they will not rise that much).
Bake for 20 to 23 minutes until a toothpick inserted in the center of a muffin comes out clean. Enjoy!
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