Peanut Butter Banana Bread
Banana bread with peanut butter worked through it — denser, richer, and it keeps for days.
What's going on here
Peanut butter is roughly 50% fat and 25% protein, so adding a substantial amount of it changes the loaf's balance rather than just its flavour. The oil comes down from half a cup to a quarter to compensate for the fat that arrives with the peanut butter — leave it at half and the loaf is greasy and refuses to set in the middle. The added protein is the more interesting effect: it competes with gluten for water and physically interrupts the starch network, giving a denser, closer crumb than plain banana bread and, usefully, a loaf that stales more slowly, because the fat coating on the starch granules slows retrogradation. Because the batter is heavier, the bake runs a little longer, and a skewer needs to come out genuinely clean rather than with the moist crumbs you'd accept in the classic version.
Ingredients
Wet
- 3Very ripe bananas, mashed
- 3/4 cupPeanut butter
- 1/4 cupNeutral oil
reduced, because the peanut butter brings fat
- 3/4 cupBrown sugar, packed
- 2Eggs
- 2 tspVanilla extract
Dry
- 2 cupsAll-purpose flour
- 1 tspBaking soda
- 1/2 tspSalt
Instructions
Prep
- Heat the oven to 175°C (350°F) and line a 9x5 loaf pan.
Wet
- Mash the bananas, then whisk in the peanut butter, oil, brown sugar, eggs, and vanilla until completely uniform.
Tip: Get the peanut butter fully incorporated now. Streaks left at this stage stay as dense, greasy seams in the baked loaf.
Dry
- Whisk the flour, baking soda, and salt together.
Combine
- Fold the dry into the wet just until no flour is visible.
Bake
- Bake until well risen and a skewer in the centre comes out clean.
Tip: This batter is heavier than plain banana bread and needs a few extra minutes. Look for a genuinely clean skewer here, not moist crumbs.
Cool
- Cool in the pan 20 minutes, then turn out onto a rack.
Claude Score
Well-built recipe. Sound ratios and real flavor development.
- Ratio soundness25% of total
- 88
- Flavor development25% of total
- 88
- Texture control20% of total
- 86
- Reliability20% of total
- 86
- Pantry accessibility10% of total
- 96
How well the formula holds up against known working ratios.
Whether the method builds flavor or merely combines ingredients.
How deliberately moisture, gluten, starch, and fat are controlled.
How much margin for error the recipe leaves a home cook.
Whether you can make it from staples, right now, with normal gear.
Correctly rebalances the fat for the peanut butter rather than just stirring it in. Texture scores a touch lower because the loaf is inherently denser.
Scored on the science of cooking — ratios, flavour development, texture control, how forgiving the method is, and whether you can make it from what's in the cupboard. Not a measure of how much you'll like it.
Tips for this recipe
Swirl instead of mixing
For a marbled loaf, hold back 1/4 cup of the peanut butter, warm it briefly so it's pourable, then dollop it over the batter in the pan and drag a knife through twice. More than twice and you've just mixed it in.
This one keeps
Wrapped at room temperature it stays moist for four or five days, noticeably longer than plain banana bread — the peanut fat slows the starch from recrystallising.