Preheat oven to 400°F.
Lay a slice of Serrano ham flat on a work surface. Peel a banana and cut it in half crosswise. Place a banana half on top of the ham, then roll the ham around it. Repeat with the remaining ham and banana halves to make 4 rolls.
4 slices Serrano ham, 2 large bananas
Arrange the rolls seam-side down in a small baking dish.
Spoon the light sour cream over the rolls, then top generously with the shredded Gruyère.
4 oz light sour cream, 6 oz Gruyère cheese
Bake for 15 minutes, or until the cheese is bubbly and golden brown.
