Step 1

Line an 8 x 8 inch pan with parchment paper and butter the parchment and sides of the pan.

Step 2

In a large microwave safe bowl, combine butter and 10 ounces of mini marshmallows. Microwave until melted and smooth checking every 30 seconds. Immediately add all the chopped chocolate and microwave for a few seconds until melted, add vanilla.

Step 3

With a rubber spatula fold in the cereal and pretzels quickly before the mixture gets cold. Press into the prepared baking dish and refrigerate until set, about 1 hour.

Step 4

Turn on broiler of oven. Top cold bars with mini marshmallows so that the top is covered, about 6 ounces. Place under broiler and cook for 1-2 minutes, until golden brown. Watch carefully so that they don’t burn. Cut right away and serve while still warm.