Stepwise Method:

• Step 1: Preheat the Oven - Start by preheating your oven to 350°F (175°C). This ensures that your cookies will bake evenly and rise beautifully.
• Step 2: Cream the Butter and Sugars - In a large mixing bowl, use your electric mixer to cream together the butter, brown sugar, and white sugar until the mixture is light and fluffy. This usually takes about 2-3 minutes.
• Step 3: Add Peanut Butter and Eggs - Next, add in the creamy peanut butter, followed by the eggs and vanilla extract. Mix until everything is well combined.
• Step 4: Combine Dry Ingredients - In a separate bowl, whisk together the flour, baking soda, baking powder, and salt. Gradually add this dry mixture to the wet ingredients, mixing until just combined. Be careful not to overmix.
• Step 5: Scoop and Bake - Using a cookie scoop, drop rounded tablespoons of dough onto a baking sheet lined with parchment paper. Make sure to leave enough space between each cookie, as they will spread while baking. Bake for 10-12 minutes, or until the edges are lightly golden.
• Step 6: Prepare the Filling - While the cookies are baking, prepare the filling. In a mixing bowl, beat together the cream cheese, marshmallow cream, and Nutella until smooth and creamy.
• Step 7: Assemble the Sandwich Cookies - Once the cookies have cooled, take one cookie and spread a generous amount of the Nutella marshmallow cream filling on the flat side. Top with another cookie, flat side down, to create a sandwich. Repeat until all cookies are filled.