Preheat oven to 350 degrees.
Spray 9×13 pan with cooking spray with flour.
Mix cake mix, 3 eggs, 1 cup milk, 1 stick melted butter, and 1 tsp. vanilla extract on low until dry ingredients are incorporated. Then increase the speed to medium and mix for a minute or two more. The batter will get thick and lighter in color.
Pour batter in prepared pan. Bake for 25 minutes. Take cake out of oven and cover with mini marshmallows. You might not need the entire bag, but make sure you cover the cake completely.
Put cake back in oven for 3 minutes. Take out when the marshmallows are melted and just the faintest bit brown on top. If you overly toast them, they will be tough.
To make the butterscotch sauce: combine 2 cups packed brown sugar, 1 cup evaporated milk, 3 TBS white corn syrup, and 5 TBS butter in a microwave safe dish. Stir. Then microwave for 1 minute at full power. Stir. Microwave for 1 minute at 50% power. Stir. Microwave for 1 minute at 50% power. Add in 1 tsp. vanilla extract.
Pour butterscotch over top of cake allowing it to completely cover the top. There will be some sauce left over. Serve cake with the additional butterscotch.
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sophy on 1.26.2010
wow, this recipe is delicious! I was drooling and eating at the same time.
bobbleheadkels on 12.4.2009
Such a great, wonderfully easy dessert recipe. Thanks so much for sharing! I will absolutely be making this again
bylaska on 8.25.2009
Oh. My. This is a treat to end all treats. We couldn’t wait for it to completely cool and ended up with warm, light and fluffy cake covered in ooey-gooey butterscotchy-marshmallowiciousness and now we need to go lick our fingers and just purr in contentedness. Seriously, a wonderful recipe. Make it immediately.
iheartcupcakes on 8.5.2009
Im making this on friday and im verrrrry excited! Haha i know its gonna be amazing thanks for sharing the recipe!!
lakenormanmom on 8.4.2009
Kate, made this tonight! Huge hit with my family!