When I want a little sweet treat I make smoothies.
My base is always frozen banana + milk + oats then do one of these:
Cinnamon + vanilla
Pumpkin + pumpkin spice+ brown sugar
Strawberries/blue berries
Cost like under a dollar to make a good cup and they are pretty filling.
Banana milk! 1 ripe banana, 1/2 cup milk, 1/2 cup water, 1 tbsp maple syrup, a few drops of vanilla extract, blend and pour through a sieve over ice. So refreshing and very cheap.