Chocolate Banana Swirl Muffins Recipe — Moist Banana & Chocolate Marble Muffins

Chocolate banana swirl muffins are moist, flavorful, and pleasantly sweet without being overpowering. The marriage of ripe banana and cocoa creates a tender, aromatic muffin with a beautiful marbled appearance and a soft crumb.

WHY YOU’LL LOVE THEM

Easy to make. These muffins come together quickly and require only simple mixing by hand.

Chocolate and banana. The classic pairing of chocolate and banana is comforting and crowd-pleasing.

Simple ingredients. Pantry staples like flour, sugar, eggs, and cocoa are all you need.

Perfect texture. The finished muffins are moist, tender, and light.

INGREDIENTS

Bananas – 3 1/2 large ripe bananas, mashed
White sugar – 3/4 cup
Egg – 1 large, at room temperature
Vegetable oil – 1/3 cup
Flour – 1 1/2 cups all-purpose flour, spooned and leveled
Baking powder – 1 tsp
Baking soda – 1 tsp
Salt – 1/2 tsp
Unsweetened cocoa powder – 2 tbsp

STEP BY STEP INSTRUCTIONS

(Full recipe details and measurements are listed below)

Preheat the oven to 425°F (220°C) and line a muffin tin with 11 liners.

In a large bowl, mash the bananas until smooth with only small bits remaining.

Stir in the sugar until combined.

Add the egg and vegetable oil, then mix until the wet ingredients are uniform.

In a medium bowl, whisk together the flour, baking powder, baking soda, and salt.

Fold the dry ingredients into the wet mixture gently. Stop as soon as the flour streaks disappear—overmixing will make the muffins dense and dry.

Divide the batter in half. Stir the cocoa powder into one half until fully incorporated to create the chocolate batter.

Spoon alternating portions of banana and chocolate batter into each muffin cup, filling them to the top.

Gently swirl the batters with a butter knife to create a marbled effect without fully blending the two batters.

Bake at 425°F for 5 minutes to set the tops and encourage a nice rise. Then reduce the oven temperature to 350°F (175°C) and bake for an additional 15 minutes, or until a toothpick inserted into the center comes out clean.

Let the muffins cool in the pan for about 10 minutes before transferring them to a wire rack to finish cooling.

FREQUENTLY ASKED QUESTIONS

Why are there two baking temperatures?

Starting at a high temperature for the first five minutes helps the muffins rise quickly and develop a domed top. Lowering the temperature finishes baking them more gently so they stay tender.

How should I store the muffins?

These muffins are best the day they are baked but can be stored at room temperature in an airtight container for up to three days. For longer storage, freeze cooled muffins in a sealed bag for up to three months.

Do the bananas need to be ripe?

Yes. Ripe bananas are sweeter, mash more easily, and contribute moisture and banana flavor to the muffins.

Do I need to bring the egg to room temperature?

Using a room-temperature egg helps the batter come together more smoothly and reduces mixing time, which improves texture. If you forget, place the egg in warm water for a few minutes to warm it up.

What does “spooned and leveled” flour mean?

Spoon flour into your measuring cup and level it with a straight edge rather than scooping the cup directly into the container. Scooping can compact the flour and cause you to use more than the recipe requires.

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