Caramel Covered Chocolate Chex Mix

I made this for a super bowl party that we went to, and have been craving it again ever since. I started with this recipe from Chex, and decided to double it for the party. I didn't have a bowl or microwave big enough to fit all of this, so I made two batches. I also used chocolate chex, and added pretzels, M&M's, and a marshmallow drizzle. At the end of the night the bowl had been basically licked clean, so I think it was a hit.

Caramel Covered Chocolate Chex Mix

8 cups of chocolate Chex cereal
2 cups of pretzels
1 cup packed brown sugar
1/2 cup of butter (but in my first batch I misread the directions and only used 1/4 c, and that turned out fine)
1/4 cup light corn syrup
1/4 teaspoon baking soda
3/4 cup mini M&M
1/2 jar of marshmallow fluff

Mix the Chex and the pretzels in the largest bowl that will fit in your microwave (if you have a tiny microwave like me). In a small glass bowl or measuring cup, mix brown sugar, butter, and corn syrup. Microwave on high about 2 minutes, until dissolved. Add baking soda and mix well. Pour into Chex bowl and stir to coat. Microwave on high for 5 minutes, stirring every minute or so. Remove from microwave and let sit for 3 minutes to cool. You want it to be cool enough not to melt the M&M's when you mix them in, but if it gets too cool they wont stick to the Chex. I spread mine out over some cut open paper bags too cool. Meanwhile, heat marshmallow fluff in microwave to melt. Pour over the Chex mix and allow to sit for a couple hours to dry.

I had originally planned on not using the marshmallow, but I thought it needed the color with the chocolate Chex. Then I thought about finding some of the Magic Shell ice cream topping in a marshmallow flavor, so that it would harden on the Chex and not be as sticky, but apparently that doesn't exist. The marshmallow still stayed a little sticky, but it wasn't bad. I think heating it first allowed it to dry out more, similar to a stale marshmallow.