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Preheat the oven to 350°F. Line a baking sheet with parchment paper and set your mini graham crusts on top.
Prepare the brownie batter according to the package directions in a medium mixing bowl.
Scoop the batter evenly into the mini crusts, filling each one about ¾ of the way full to leave room for rising.
Bake for 20–24 minutes, or until the tops look set and a toothpick comes out with a few fudgy crumbs.
Carefully remove the pies from the oven. Sprinkle a generous handful of mini marshmallows, chocolate chips, and toffee bits over each one.
Pop them back in the oven for another 3–5 minutes, just until the marshmallows are puffed and slightly golden. Watch closely so they don’t burn!
Cool for 10–15 minutes before serving. If you’d like, sprinkle a pinch of flaky sea salt over the top for that sweet-salty magic.
Serving: 1mini pie, Calories: 410kcal, Carbohydrates: 51g, Protein: 4g, Fat: 22g, Saturated Fat: 8g, Polyunsaturated Fat: 1g, Monounsaturated Fat: 9g, Trans Fat: 0.01g, Cholesterol: 4mg, Sodium: 259mg, Potassium: 144mg, Fiber: 3g, Sugar: 26g, Vitamin A: 9IU, Calcium: 24mg, Iron: 2mg