Preheat oven to 400 degrees F.
Lightly grease each slot of a standard muffin tin or use paper liners.
Prepare flax eggs in a small bowl, by mixing together the ground flax & water. Set aside about 10 minutes. It will thicken up and become gel-like.
When the flax eggs are ready, add all the ingredients (except the toppings) into a high-powered blender or food processor. Blend until smooth, about 1-2 minutes. Scrape down sides as needed.
Pour mixture into each slot about 3/4 of the way full. Sprinkle each one with your favorite toppings Bake for 15-18 minutes, until lightly golden brown. Insert a toothpick in the middle of a muffin or two. If it comes out mostly clean, they are done.
Let muffins cool for 10 minutes in the pan before transferring them to a cooling rack, then cool for another 10-15 minutes (muffins may flatten).