Line 12 muffin cups with paper liners.** Preheat the oven to 325 degrees F.
Whisk the flax meal, baking powder, salt and cinnamon in a large bowl to blend. Beat the Stevia, oil, eggs and vanilla in another bowl to blend. Add the dry ingredients to the wet ingredients and stir just until blended (do not overmix).
Divide the batter among the prepared muffin cups. Bake the muffins on the middle rack until the tops are golden brown and a skewer inserted into the center comes out with no crumbs attached, about 25 minutes.
Transfer the muffins to a rack to cool. Top muffins with peanut or almond butter.