Healthy Baked Pumpkin Waffles

white whole wheat flour or gluten-free* flour (measured like this)

homemade pumpkin spice (see Notes!)

baking soda

baking powder

salt

unsalted butter or coconut oil, melted

large egg whites, room temperature

vanilla extract

pure maple syrup, room temperature

pumpkin purée (not pumpkin pie mix!)

plain nonfat Greek yogurt

white vinegar

nonfat milk

+ 2 tbsp (150mL) water