Preheat oven to 325°F/165°C.
Lightly coat muffin cups with nonstick spray or line with paper liners.
In a large mixing bowl, whisk together almond flour, cocoa powder, baking soda, sea salt, and cinnamon (dry ingredients).
In a medium bowl, briskly whisk together eggs, yogurt, stevia, almond milk, coconut oil, and vanilla extract (wet ingredients).
Make a well in the center of dry ingredients and add wet ingredients. Gently stir by hand, just until dry ingredients disappear.
With a muffin scoop or similar, fill the muffin cups 2/3 of the way to top with batter.
Bake 18-22 minutes, or until a toothpick inserted in the center of a muffin comes out clean. Remove from the oven and place pan on wire rack.
Let the muffins cool in pan for 5 minutes, then gently remove them from the pan and place them on rack to finish cooling completely.
Decorate with red currants (optional).