Perhaps this has been done before, it is new to me.
Abstract: Couple of gooey layers topped with a chewy layer.
Gooey ingredients: Peanut butter, Nutella, chocolate syrup, caramel topping for ice cream, marshmallow topping, or fruit jelly
Chewy ingredients: Granola, seeds, nuts, dried fruit
I started with a dollar store peanut butter jar (with a tight fitting lid) that is shallow enough for my short spoon to reach to the bottom. The jar had about 3/4 of an inch of PB left in it. I added an equal amount of Nutella chocolate sauce and went on the trail. There I added a few spoonfuls of granola, dipped my spoon vertically to get some of both gooey layers on it, and scooped up some of the granola–candy bar flavors on the spoon. I stopped when the granola was gone. The next meal's dessert had dried cherries with the PB and chocolate. My next mix will be chocolate, caramel, marshmallow, and peanuts–almost Snicker ingredients.
Yes, the plastic jar has some weight but most ingredients are high calorie which reduces that disadvantage. To save weight, I try to only carry foods of 125 or more calories per ounce = 2000 calories per pound.

