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Export 9 ingredients for grocery delivery
Step 1
Preheat the oven to 375 degrees F.
Step 2
Line two baking sheets with parchment paper or silicone baking mats.
Step 3
Melt the butter in a heavy saucepan.
Step 4
Add the brown sugar and the granulated sugar to a large bowl.
Step 5
Pour the melted butter over the sugar, stirring to combine, then let stand for 5 minutes.
Step 6
Add the egg and the egg yolk to the sugar mixture, stirring to combine.
Step 7
Stir the vanilla into the sugar mixture.
Step 8
Add the flour, the cocoa powder, the baking soda, and the salt to the sugar mixture, stirring until just combined.
Step 9
Stir the chopped chocolate and the marshmallow bits into the dough mixture.
Step 10
Chill the dough in the fridge for at least 30 minutes and up to 2 days. This allows the flavors to meld and the butter to chill, improving the flavors.
Step 11
Drop 1 1/2-tablespoon-sized scoops onto the prepared cookie sheet, keeping them about 2 inches apart.
Step 12
Bake until the cookies are set and slightly underdone in the center, about 8-12 minutes.
Step 13
Let the cookies cool on the cookie sheet for 5 minutes, then allow them to cool completely on a wire rack.
Step 14
Serve.
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