Creating Banana Cream Cheese Cupcakes is a straightforward process if you follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Prepare a cupcake pan with liners.
2. Mix Dry Ingredients: In a mixing bowl, combine the flour, baking soda, baking powder, and salt. Whisk to evenly distribute the ingredients.
3. Cream Butter and Sugar: In another bowl, beat the softened butter with granulated sugar until light and fluffy, about 2–3 minutes.
4. Add Eggs: Add the eggs one at a time, mixing well after each addition until fully incorporated.
5. Incorporate Bananas: Mix in the mashed bananas and vanilla extract, ensuring everything is combined well.
6. Combine with Dry Ingredients: Gradually add the dry ingredients to the wet mixture, alternating with the sour cream. Start and end with the dry mixture. Mix until just combined. Avoid overmixing.
7. Fill Cupcake Liners: Spoon the batter into the prepared cupcake liners, filling each about two-thirds full.
8. Bake: Bake in the preheated oven for 18–20 minutes or until a toothpick inserted in the center comes out clean.
9. Cool: Remove from the oven and allow the cupcakes to cool in the pan for about 10 minutes. Then transfer them to wire racks to cool completely.
10. Prepare Frosting: In a bowl, beat the softened cream cheese until smooth. Gradually add the powdered sugar, mixing until combined and fluffy. Add a teaspoon of milk if needed to achieve the desired consistency.
11. Frost Cupcakes: Once the cupcakes are completely cool, generously frost each one with the cream cheese frosting using a piping bag or simply a knife.
12. Garnish: Optionally, top with sliced bananas or chopped walnuts for added texture and taste.

Following these steps will ensure you create incredible Banana Cream Cheese Cupcakes that are sure to impress!