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.
Oh yes! Yogurt with some crunch and fruit is just SOOO good, and you can get a like $4 tub of yogurt that lets you eat some every day for a week.