Make Cinnamon Crumb Topping:
Prepare cinnamon crumb topping: In a small bowl, mix 2 tbsp room-temperature coconut oil, 2 tbsp coconut flour, 2 tbsp tigernut flour, 2 tbsp coconut sugar, 1/2 tsp vanilla extract, 1 tsp cinnamon, and a pinch of sea salt. Work the mixture with your hands until it forms clumps.Whisk Dry Ingredients:
In a large bowl, whisk together 3/4 cup tigernut flour, 1/2 cup tapioca starch, 1/4 cup coconut flour, 1 tsp baking soda, 1/2 tsp sea salt, and 1/2 tsp cinnamon.Mix Wet Ingredients:
In another bowl, combine 1/4 cup + 2 tbsp melted coconut oil, 3/4 cup unsweetened applesauce, 1/2 cup full-fat coconut milk, and 1 tsp vanilla extract.Combine Wet and Dry:
Create a well in the dry ingredients, pour in the wet mixture, and stir until just combined.Prepare Gelatin Egg:
Make gelatin egg: In a small bowl, whisk together 1 tbsp gelatin, 1 tbsp apple cider vinegar, and 2 tbsp hot water with a fork until the gelatin dissolves and the mixture becomes frothy.Fold in Gelatin Egg:
Gently fold the gelatin egg into the batter.Fill Liners and Add Topping:
Divide batter among the muffin liners, then sprinkle the cinnamon crumb topping on top. Lightly press the topping into the batter to help it adhere.Bake Muffins:
Bake on the middle rack for 27–30 minutes, until a toothpick inserted into the center comes out clean.Make Coconut Icing:
If making icing, prepare it while muffins cool: In a small bowl, stir together 1/4 cup melted coconut butter, 2 tbsp maple syrup, 2 tbsp full-fat coconut milk, 1 tsp vanilla extract, and a pinch of sea salt.