Preheat oven 350 degrees Fahrenheit.
In a large bowl, add gluten-free flour, buckwheat flour, sugar, chia seeds, baking soda and salt. Whisk to combine.
In a separate bowl, add eggs, coconut oil, vanilla extract, orange juice and lemon juice. Whisk to combine.
Add dry ingredients into the wet and stir to incorporate.
Add a scoopful of batter into a greased or lined muffin tin.
Bake for 20-25 minutes.
Allow muffins to cool. Top with orange zest and enjoy!