Rocky Road Brownies

1: Mix together eggs, cocoa powder, salt, baking powder, espresso powder, and vanilla.

2: In a separate bowl, cream the melted butter and sugar until shiny.

3: Combine the egg mixture with the butter mixture well.

4: Add flour and mix gently, being careful not to overmix.

5: Add half of the chocolate chips and half of the nuts to the mixture.

6: Pour the batter into a 9x9 pan.

7: Top with the remaining chocolate chips, nuts, and marshmallows.

8: Optionally, freeze the marshmallows before adding them on top to prevent melting too quickly.

9: Bake for 27-30 minutes in the preheated oven.