Preheat oven to 350F and line a large baking sheet with parchment or a silicone mat.In a large bowl, whisk together the coconut flour, almond flour, baking powder, garlic powder and salt. Whisk in 1/2 cup of the shredded Cheddar.Stir in eggs, sour cream and melted butter until well combined.Drop by rounded spoonfuls onto prepared baking sheet. These are very filling and they spread and rise so make the mounds smallish. You should get 10 to 12 biscuits.Sprinkle with remaining 1/4 cup Cheddar.Bake 20 to 23 minutes, until firm to the touch and cheese is just starting to brown.Remove and let cool 5 minutes.