Add the cauliflower florets to a microwave safe bowl. Microwave for 7-8 minutes or until slightly tender (or your desired texture). You can steam it instead, if you don't have or want to use a microwave, but I would not boil it, it will be too watery. Drain any water and pat dry with paper towels.
Heat a saucepan to medium and melt the butter. Add in the heavy cream. Then the mascarpone cheese. Add salt and pepper to taste. Add in the shredded cheddar. Then whisk in the buffalo sauce.
And finally, whisk in the blue cheese dressing. Mix until well combined and smooth. Remove from the heat.
Pour the sauce over the cauliflower and toss to coat. Serve with a drizzle of the buffalo wing sauce and top with blue cheese crumbles.