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.
"Water is your enemy in ice cream," says Jeni Britton Bauer, author of Jeni's Splendid Ice Creams at Home. "That's what turns into ice." She shares her tips for fighting the enemy when making ice cream at home.