Can this be made in under 30 minutes?

Yes, the recipe is designed to be quick and efficient.

Does it work for meal prep?

Most versions store well for one to three days.

Yes, simple swaps can be made for convenience or dietary needs.

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Preheat the oven to 350°F (175°C).
In a large bowl, cream together the butter, granulated sugar, and brown sugar until smooth.
Beat in the eggs one at a time, then stir in the vanilla.
In another bowl, whisk together the flour, cocoa powder, baking soda, and salt. Gradually blend the dry ingredients into the creamed mixture.
Fold in the chocolate chips and mini marshmallows.
Drop by spoonfuls onto ungreased baking sheets.
Bake for 10-12 minutes until the edges are set and the tops look slightly puffed.
Allow cookies to cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.

For best results, use room-temperature butter and eggs. Chill dough if warm, and add extra chocolate chips on top for a glossy finish.