Why it works: Walnut and chocolate are a kitchen classic. They rank in the top 4% of all ingredient pairs, and 1,548 recipes mention both. Both carry 3-ethyl-2,5-dimethylpyrazine, which smells roasted, nutty. The science ↓
The recipe
about 4 dozen barsIngredients
Contains: egg, milk, wheat, tree nuts (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Prepare the dough
Heat oven to 350°F.
Beat butter and brown sugar in a large bowl until well blended.
Add eggs, vanilla, and instant coffee (if desired); beat until fluffy.
Stir together oats, flour, baking soda, salt, and 1 cup walnuts; gradually stir into butter mixture with a spoon.
Set aside 2 cups of dough.
Assemble
Press remaining dough evenly onto the bottom of an ungreased 15‑1/2 × 10‑1/2 × 1‑inch jelly roll pan.
Prepare chocolate filling and spread it evenly over the dough.
Crumble reserved dough evenly over the filling.
Sprinkle with the remaining 1/2 cup walnuts.
Bake and cool
Bake for 25 minutes or until the top is golden brown; the chocolate will be soft.
Cool completely in the pan on a wire rack, then cut into bars.
Yield about 4 dozen bars.
This recipe comes from the Recipes Wiki on Fandom and is licensed CC BY-SA 4.0. Our formatting and summaries are shared under the same licence.
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 aroma chemistry they share, and how many recipes mention both.
-
Walnut + chocolatetop 4% of all pairsAroma overlapmoderateMentioned together1,548 recipes
Shared aroma: 3-ethyl-2,5-dimethylpyrazine (roasted, nutty).
-
Coffee + chocolatetop 2% of all pairsAroma overlapstrongMentioned together1,497 recipes
Shared aroma: 2,3-butanedione (buttery, creamy).
-
Vanilla + chocolatetop 2% of all pairsAroma overlapmoderateMentioned together10,018 recipes
Shared aroma: sotolon (curry, maple).
-
Vanilla + oatstop 3% of all pairsAroma overlapstrongMentioned together1,532 recipes
Shared aroma: gamma-nonanolactone (coconut, creamy).
-
Sugar + vanillatop 3% of all pairsAroma overlaplowMentioned together35,031 recipes
Shared aroma: beta-damascenone (apple, rose).
Sugar and vanilla share little aroma chemistry, yet 35,031 recipes mention both: they likely work on texture and structure more than aroma.
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Butter
- Adds fat and richness, and helps create a tender, crumbly texture.
- Brown sugar
- Adds moisture and sweetness, and gives the bars a chewy, caramel-like depth.
- Eggs
- Bind the dough and add structure while helping it turn fluffy when beaten.
- All-purpose flour
- Provides the structure that holds the bars together.
- Quick-cooking rolled oats
- Add chewy body and a hearty texture to the dough.
- Baking soda
- Reacts to lift the dough and encourages browning in the oven.
The step that matters
Cool completely before cutting. The filling is soft when hot and sets as it cools. Cutting too early causes the bars to crumble and smear, so full cooling gives clean, neat bars.
“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.
You might also like
Illustration
Illustration
Illustration
IllustrationThe Sunday pairing: one pairing, the chemistry behind it, and how to cook it. No spam, unsubscribe anytime.
Prefer an account? Create a free account for sign-in; Pro adds the full results and chemistry.