Low calorie fall treats?

Guys I felt a single crisp in the air and I’m in full fall mode – does anyone have any good recommendations for low calorie pumpkin spice like treats? I’m a college student so I don’t have an oven but I do have a microwave, small toaster oven and small electric skillet so if you have any single serving recipes like mug cakes that’d be great too.

I found a few I thought might look good if anyone’s tried them and liked them before I spend all my money??