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1
Preheat your oven to 325 F and line an 8-inch-square baking pan with foil so that the foil hangs over the edges and spray it with nonstick cooking spray.
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2
Use a medium-sized bowl to mix together the melted butter, graham cracker crumbs and sugar. Press the crumb mixture evenly into the bottom of the pan.
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3
Bake until golden, or for about 20 minutes. Remove pan from the oven and set aside.
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4
Raise the oven temperature to 350 F.
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5
Meanwhile, use a medium-sized bowl and mix the brownie mixture together, then gently fold in the raspberries. Pour the batter over the graham cracker crust.
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6
Bake the brownie mixture for about 25 minutes (based on your brownie mix instructions), or until a toothpick inserted in the middle of the brownie comes out clean. Remove the brownie from the oven and place the oven on broil.
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7
Meanwhile, break the two graham crackers into small pieces and arrange them in a single layer on top of the brownie. Next arrange the mini marshmallows evenly over the top of the graham crackers.
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8
Place the pan back in the oven, just for a few minutes, until the marshmallows begin to brown. Keep a close eye on them so they don't burn under the broiler.
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9
Remove from the oven and cool completely. Remove them from the pan using the overhanging foil and cut into bars to serve.
