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.