Sky-High Bakery-Style Banana Chocolate Chip Muffins Step-by-step instructions

Before you start

Before starting, make sure all ingredients are at room temperature. The egg, sour cream, and melted butter should be warm, not cold, to help the batter emulsify. Preheat the oven only when you are ready to bake, not during the rest period.

Line a 12-cup muffin tin with paper liners. Measure out the flour, baking powder, baking soda, and salt into a bowl. Have the chocolate chips measured and ready to fold in. The rest period is a great time to clean up the kitchen or prep other parts of your meal.

Instructions

Mixing the Batter

1. 1Mash and Mix Wet Ingredients
   In a large mixing bowl, mash the three ripe bananas with a fork or potato masher until mostly smooth with a few small lumps. Add the granulated sugar, brown sugar, egg, melted butter, vanilla extract, and sour cream. Whisk vigorously for about 30 seconds until the mixture is creamy and well combined, with no streaks of egg or butter.
   Look for The mixture should be smooth, glossy, and slightly thickened, with the sugars dissolved.
   Tip Use very ripe bananas with brown spots for the most banana flavor and natural sweetness.
2. 2Whisk Dry Ingredients
   In a separate medium bowl, whisk together the all-purpose flour, baking powder, baking soda, and salt until evenly distributed. This ensures the leaveners are well mixed so the muffins rise evenly.
   Look for The flour mixture should look uniform with no visible clumps of baking soda or powder.
   Tip Whisking dry ingredients separately prevents overmixing later, which keeps muffins tender.
3. 3Combine Wet and Dry
   Add the dry ingredients to the wet mixture. Use a spatula to fold gently until just combined. The batter should be thick and slightly lumpy; do not overmix. Fold in 1 cup of the chocolate chips, reserving the remaining 1/2 cup for topping.
   Look for The batter should be cohesive with no dry flour streaks, but still a bit lumpy.
   Tip Overmixing develops gluten, which makes muffins tough. Stop as soon as the flour disappears.

The wet ingredients should be smooth and creamy, with the sugar completely dissolved. After folding in the dry ingredients, the batter should be thick, slightly lumpy, and free of dry flour streaks. The chocolate chips should be evenly distributed throughout. The batter should not be overmixed—it should look slightly rough but cohesive. When scooped, it should hold its shape in the liner rather than spreading flat.

Resting and Filling

4. 4Scoop into Liners
   Line a 12-cup muffin tin with paper liners. Scoop the batter evenly into the liners, filling each almost to the top. The high fill level is key for sky-high domes. Sprinkle the remaining 1/2 cup chocolate chips over the tops.
   Look for The liners should be nearly full, with batter mounded slightly above the rim.
   Tip Use a large ice cream scoop for even portions and less mess.
5. 5Rest the Batter
   Let the filled muffin tin rest at room temperature for 1 hour. This allows the starches to hydrate and the leavening to activate, which helps create taller, more tender muffins.
   Look for The batter will look slightly puffed and glossy on the surface.
   Tip Set a timer so the rest doesn't get forgotten—this step is essential for the sky-high effect.

After the one-hour rest, the batter will look slightly puffed and glossy on the surface. The liners should be filled almost to the brim, with a slight mound of batter in the center. The chocolate chips on top should be visible and evenly scattered.

The batter should feel thick and slightly tacky when touched. This is the moment to ensure the oven is preheated and ready, as the baking process will begin immediately after the rest.

Baking and Finishing

6. 6Bake at High Temperature
   Preheat the oven to 425°F (220°C). Place the muffin tin on the middle rack and bake for 5 minutes. The initial high heat creates a burst of steam that lifts the batter, producing a dramatic dome.
   Look for After 5 minutes, the tops should just start to rise and turn golden at the edges.
   Tip Do not open the oven during this first stage—the sudden temperature drop can deflate the muffins.
7. 7Reduce Heat and Finish Baking
   Without opening the oven, reduce the temperature to 375°F (190°C) and continue baking for 15 minutes, or until the tops are deep golden brown and a toothpick inserted into the center comes out with only a few moist crumbs. The internal temperature of the muffins should reach 200°F (93°C) to ensure the egg is fully set.
   Look for The muffins will be tall, domed, and spring back when pressed gently in the center.
   Safe temperature 160°F (71°C) internal temperature (egg dishes)
   Tip If the tops brown too quickly, tent loosely with foil for the last few minutes.
8. 8Cool and Serve
   Remove the muffin tin from the oven and let the muffins cool in the pan for 5 minutes. Then transfer them to a wire rack to cool slightly. Serve warm so the chocolate is still molten and oozing.
   Look for The muffins should be golden brown, with melted chocolate chips visible on top.
   Tip For the best experience, enjoy within 30 minutes of baking while the centers are still gooey.

During the first five minutes at 425°F, the muffins will rise dramatically, forming a domed top. After lowering the heat to 375°F, they will continue to bake and turn golden brown. The kitchen will smell of banana and butter. When done, the tops should spring back when pressed gently, and a toothpick should come out with just a few moist crumbs. The muffins should be evenly browned and the chocolate on top melted and glossy.

Common mistakes

One common mistake is overmixing the batter, which activates gluten and makes the muffins tough. Mix only until the flour disappears. Another issue is under-filling the liners—if they are only two-thirds full, the muffins will not rise as high.

The rest period is not optional; skipping it can result in flatter, denser muffins. Finally, resist the urge to open the oven during the first five minutes of baking, as the sudden temperature drop can cause the muffins to collapse.

How to tell it’s done

The muffins are done when they are tall and golden brown on top, and a toothpick inserted into the center comes out with only a few moist crumbs attached. The internal temperature of the muffins should read 200°F (93°C) on an instant-read thermometer.

This ensures the egg is fully cooked and the crumb is set but still moist. If the tops are browning too quickly, tent with foil during the last few minutes. Letting them cool for five minutes in the pan helps them set without becoming soggy.

• Egg dishes: 160°F (71°C) in the thickest part