In a large pan toss cauliflower and garlic with oil. Spread so in a single layer and not bunched in.Season with salt and pepper to taste. Roast 25 minutes toss and roast for 10 more minutes.
Add milk, paprika, fire roasted and chipotle peppers to blender and blend till smooth.
Meanwhile in a microwave safe dish heat butter when melted add flour stir and add milk mixture whisking in till smooth heat in microwave oven 3 minutes,stirring when needed add cheese stirring in till melted heating in micro 2-3 more minutes. Keep an eye on it so it doesn`t bubble over.