1. Preheat oven to 350. Butter a deep 1-1/2 quart baking dish, and add cooked macaroni.
2. In a blender or food processor combine egg, milk, and garlic, and process 3 seconds. Add onion, cheeses, peppers, salt, and paprika, and blend 10 seconds. Turn into the baking dish, folding into macaroni.
3. Melt butter in a small saucepan. Coat crackers with butter and spread over top of casserole. Bake about 30 to 35 minutes, or until thick yet creamy. Remove from oven, let stand about 5 minutes and serve.
Megan Krigbaum, senior wine editor at Food & Wine, uses tea, Cheerios and marshmallows to taste for tannin, sweetness and oak in wine.