Fill popsicle molds with 1 tablepoon dulce de leche mixture; add some bananas and 1/4 teaspoon dulce de leche. Add another tablespoon of the dulce de leche mixture, some mulberries, 1/4 teaspoon dulce de leche and finish it up with 1 tablespoon of dulce de leche mixture.
Place popsicle sticks to each mold and place in the frezzer for 5 hours or overnight.
If you don't have sour cream, use heavy cream or Greek yogurt.
If you don't have popsicle molds, use disposable cups.