Name: Double-decker Bars
Ingredients: ½ cup butter; 1½ cups graham cracker crumbs; 14 ounce can sweetened condensed milk; 12 ounce package milk chocolate chips; 1 cup peanut butter chips

Why it works: Chocolate and peanut are a kitchen classic. They rank in the top 6% of all ingredient pairs, and cooks put them together in 1,279 recipes. Both carry 2-ethyl-3,6-dimethylpyrazine, which smells roasted, nutty. The science ↓

Double-decker Bars

Oven350°F

Time30 minutes

Ingredients

½ cup butter
1½ cups graham cracker crumbs
14 ounce can sweetened condensed milk
12 ounce package milk chocolate chips
1 cup peanut butter chips

Directions

Prepare

Preheat oven to 350°F.
Melt butter in a rectangular baking pan, then sprinkle crumbs evenly over the pan.

Assemble and bake

Pour sweetened condensed milk over crumbs, then add chocolate chips and peanut butter chips, pressing down firmly.
Bake for 30 minutes.

Cool and serve

Cool and cut into bars.

Nutrition, whole recipe (rough)

633Calories

18 gProtein

44 gFat

45 gCarbs

What these numbers assume: 5 portions

Ingredient	Portion assumed	kcal
Peanut	1 oz (28g)	161
Chocolate	1 oz (28g) semisweet	155
Milk	1 cup (244ml) whole	149
Butter	1 tbsp (14g)	102
Cracker	5 saltine crackers (15g)	66

One typical portion per ingredient; the recipe's quantities are not counted. A rough guide only, not for medical or dietary planning.

Recipe from the Recipes Wiki (Fandom).

Steps grouped into stages for easier reading; the method is the source's own.

Explore the science

The flavor team

The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.

Chocolate + peanuttop 6% of all pairs

Smell alikemoderate

Cooked together1,279 recipes

Shared aroma: 2-ethyl-3,6-dimethylpyrazine (roasted, nutty).
Butter + milktop 7% of all pairs

Smell alikemoderate

Cooked together81,283 recipes

Shared aroma: (z)-4-heptenal (biscuit, cream).
Condensed milk + chocolatetop 12% of all pairs

Smell alikelow

Cooked together541 recipes

Shared aroma: ethanol (alcoholic, ethereal).
Milk + chocolatetop 13% of all pairs

Smell alikemoderate

Cooked together9,128 recipes

Shared aroma: gamma-nonanolactone (coconut, sweet).
Milk + peanuttop 14% of all pairs

Smell alikemoderate

Cooked together1,048 recipes

Shared aroma: 2-undecenal (sweet).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Sweetened condensed milk: Provides sweetness and moisture, binding the toppings into a chewy, set layer.
Graham cracker crumbs: Form the buttery base that holds the bars together.
Milk chocolate chips: Melt into the condensed milk to add richness and a fudgy texture.
Peanut butter chips: Add nutty flavour and fat that melt into the bars.

Swap the peanut

How well each one fits the dish's main ingredients (butter, condensed milk, milk, chocolate):

Peanutthe original
Pecansfits about as well
Almondfits about as well
Cocoafits less well

Fit is the average pairing score against butter, condensed milk, milk, chocolate. Candidates are from the same food group and used in at least 100 recipes.

“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.