Ingredient:

• 3 tablespoons plus 2 cups gluten-free all-purpose baking flour, divided
• 2 cups sugar
• 3/4 cup baking cocoa
• 1/4 cup ground flaxseed
• 1/4 cup chia seeds
• 2 teaspoons baking powder
• 1-1/2 teaspoons baking soda
• 1 teaspoon salt
• 1 to 2 teaspoons instant espresso powder
• 1/2 teaspoon xanthan gum
• 1 cup boiling water
• 1 cup unsweetened almond milk
• 1 cup canola oil
• 4 teaspoons vanilla extract
• Confectioners' sugar