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Preheat oven to 325 degrees Fahrenheit. Line a muffin tray with 6 cupcake liners
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To make crumble topping, mix all ingredients well with a fork until crumbly. Set aside.
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Sift together cassava flour, coconut flour, baking soda, cinnamon, and salt.
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In a separate bowl beat eggs, honey, and sugar with an electric mixer until well creamed. Add avocado oil and continue to beat well, about 2 minutes. Stir in cream of tartar, vanilla, and coconut milk.
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Make a well in the dry ingredients and add in the wet, mixing well. Fold in the diced apple.
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Spoon the batter into the muffin tins about 3/4 of the way full, then top with crumble.
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Bake for 25 minutes, or until a knife comes out clean.