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Pre-heat the oven to 350 degrees and lightly grease and flour an 8x8 baking dish.
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In a small bowl, whisk together the chickpea flour, gluten-free flour, baking powder, baking soda, cinnamon and salt.
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In a mixing bowl, combine the butter, sugar and maple syrup. Mix on medium speed for 2 minutes.
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Add the vanilla extract and the eggs, one at a time, to the mixing bowl. Scrap down the sides and mix to incorporate between each addition.
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Mix in half of the flour mixture, then the buttermilk, then the remaining flour. Continue to mix until the batter is just combined.
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Pour the mixture into the prepared baking dish.
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To make the crumble, combine all ingredients in a bowl. Use your fingers or a fork to mix it together into a crumbly mixture. Sprinkle evenly on top of the cake batter then bake for 40-45 minutes until a toothpick inserted in the center comes out clean.
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Allow cake to cool slightly before serving.