Preheat oven to 350 degrees F. Add silicone muffin liners to a 12 cup muffin pan.
Whisk together eggs and brown sugar, then mix in yogurt, milk, coconut oil and vanilla extract. Mix until smooth.
In a separate bowl, whisk together oat flour, baking powder and cinnamon
Combine wet and dry ingredients and mix until no clumps remain.
Fill each muffin cup ~3/4 to the top. Sprinkle crumble topping on each.
Bake for 22-24 minutes.
Let cool & enjoy!