Healthy Banana Cream Pie Milkshake

medium bananas (mine were 188 grams each), peeled and sliced into 1" chunks and frozen for at least 2 hours

vanilla extract

cinnamon

plain or vanilla Greek yogurt or dairy-free / vegan Greek cultured coconut milk

cup milk of choice, plus additional if desired

whipping or heavy cream (use coconut cream for a dairy-free / vegan version) (I don't like a lot of cream and only used 2 tablespoons)

graham cracker crumbs (homemade whole wheat graham crackers or homemade grain-free graham crackers or homemade gluten-free and vegan graham crackers)