1. Preheat the Oven and Prepare the Muffin Tin

Start by preheating your oven to 350°F (175°C). This is the ideal temperature for baking these cupcakes to perfection. As your oven is heating, line a 12-cup muffin tin with paper liners. This will prevent the cupcakes from sticking to the pan and makes cleanup much easier. If you don’t have paper liners, you can lightly grease the muffin tin with cooking spray or butter.

2. Mix Dry Ingredients

In a medium-sized bowl, whisk together the dry ingredients: flour, baking powder, baking soda, and salt. Whisking the dry ingredients before adding them to the wet ingredients helps ensure that the baking powder and baking soda are evenly distributed, which will make your cupcakes rise beautifully. Set this bowl aside as you move on to the next step.

3. Cream Butter and Sugar

In a large mixing bowl, cream together the softened butter and granulated sugar. Use a hand mixer or stand mixer to beat them together until the mixture becomes light and fluffy. This step is crucial because it helps incorporate air into the batter, which gives the cupcakes their light, soft texture. You’ll know the butter and sugar are properly creamed when the mixture is pale and slightly increased in volume.

4. Add Eggs and Bananas

Add the eggs one at a time, mixing well after each addition. Be sure to beat the eggs in thoroughly so that they are fully incorporated into the batter. Next, stir in the vanilla extract and mashed bananas. Bananas add natural sweetness and moisture to the cupcakes, so make sure you mash them well. If you’re unsure about the ripeness of your bananas, look for ones with dark spots on the skin, as they are the sweetest and easiest to mash.

5. Combine Wet and Dry Ingredients

Now, it’s time to add the dry ingredients to the wet ingredients. Do this gradually, alternating between adding the dry ingredients and sour cream. Begin and end with the dry ingredients, mixing gently until everything is combined. Be careful not to overmix the batter, as this can lead to dense cupcakes. The batter should be smooth but slightly thick.

6. Fill the Muffin Cups

Evenly distribute the batter into the 12 muffin cups, filling each cup about two-thirds full. This allows room for the cupcakes to rise without overflowing. If you have extra batter, you can divide it evenly between the cups, but don’t fill them all the way to the top.

7. Bake the Cupcakes

Bake the cupcakes for 18-20 minutes, or until a toothpick inserted into the center of a cupcake comes out clean. Every oven is different, so start checking them around the 18-minute mark to ensure they don’t overbake. Once they’re done, remove them from the oven and let them cool in the tin for about 5 minutes. After that, transfer the cupcakes to a wire rack to cool completely.

8. Prepare the Cream Cheese Filling

While the cupcakes are cooling, make the cream cheese filling. In a small bowl, beat the softened cream cheese, powdered sugar, and vanilla extract until smooth and creamy. This filling will add a delicious, tangy surprise in the center of each cupcake, balancing out the sweetness of the banana and frosting.

9. Fill the Cupcakes

Once the cupcakes have cooled completely, use a small knife or cupcake corer to create a hole in the center of each cupcake. Be sure not to cut all the way through the bottom. Fill each hole with a generous amount of the cream cheese filling. Don’t skimp on this part—more filling means more deliciousness!

10. Prepare the Frosting

For the frosting, beat the softened butter until it becomes creamy and smooth. Gradually add the powdered sugar, vanilla extract, and heavy cream, mixing until the frosting is light and fluffy. The frosting should have a smooth, spreadable consistency. If it’s too thick, add a bit more cream; if it’s too thin, add more powdered sugar until it reaches the right consistency.

11. Frost the Cupcakes

Once the cupcakes are filled with the cream cheese mixture, it’s time to frost them! Pipe or spread the frosting generously onto each cupcake. You can use a simple round tip for piping or just spread the frosting with a spatula. For an extra special touch, top each cupcake with a slice of banana and a sprinkle of cinnamon.