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1. Preheat oven to 350 degrees and grease (or line with parchment) a 9-inch square pan.
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2. Combine flour, baking soda, baking powder, salt, cinnamon and nutmeg together.
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3. In a separate bowl, combine egg, pumpkin, brown sugar, vegetable oil, milk and vanilla extract.
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4. Combine the wet and the dry ingredients and stir just until combined. Do not over mix. Pour into prepared pan and spread out evenly.
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5. Topping: Combine all ingredients and sprinkle over cake batter.
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6. Bake for 30-40 minutes or until an inserted knife comes out clean from the center.
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7. Let cool.
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8. Icing: Whisk powdered sugar with 2 tablespoons of milk, add a little more milk if needed (I didn't need it). Drizzle over cake and serve!