Step 1

Preheat: 30 minutes prior to baking, preheat the oven to 375°F (190°C).

Step 2

Mix Dry Ingredients: In a medium bowl combine flour, baking powder, baking soda, and salt together.

Step 3

Combine Dry and Wet Ingredients: With the mixer on low, add the dry ingredients to the wet. Mix just until the ingredients are evenly distributed, for about 15-45 seconds. It is critical here not to overmix. In fact, the dough should look shaggy. Hand mix in the chocolate chips and marshmallows in the batter.

Step 4

Scoop and Bake: Line a baking sheet with parchment paper or a silicone mat. Using a cookie scooper, scoop cookie dough onto the mat. Space cookies 2 inches apart. Bake the cookies for 12 - 14 minutes. Cookies should be golden brown when done. There might be some caramelization from the brown sugar.