Cheesy Mashed Cauliflower Puffs

Preheat oven to 400F and grease a non-stick muffin tin well.
Set a steam basket into a large pot and fill the bottom with an inch or two of water. Add cauliflower and garlic to pot and set over medium heat. Steam 7 to 10 minutes, or until quite tender.
Drain well and transfer to a food processor (including garlic cloves).
Puree until smooth and transfer to a large bowl. Stir in sour cream, cheddar, parsley, salt and pepper. Stir in eggs until well-combined. 
In a separate bowl, beat egg whites until quite stiff but not dry. Gently fold egg whites into cauliflower mixture until just combined.
Divide evenly between prepared muffin cups and bake 18 to 22 minutes, until puffed and set and golden brown.
Remove from oven and serve immediately.