YIELD: 12 cookie bars
Pour hot melted butter over 1 cup of the white chocolate chips, do not stir. Leave for 2 minutes, then stir until mostly combined. Set aside to cool, about 10 minutes.
In a large bowl, whisk together flour, brown sugar, baking powder, and salt. Add the eggs, vanilla, and white chocolate mixture to the flour mixture. Mix until just combined.
Fold in the remaining 1 cup of white chocolate chips and Lucky Charm marshmallows.
Spread into a greased 9x9inch pan. Bake at 325 degrees for 20-22 minutes, or until edges are golden brown and a toothpick inserted near the center comes out clean.
Top with your favorite frosting and enjoy!
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