Onion Souffle Squares
["6 large garlic cloves, peeled", "5 large onions, peeled and cut into 8ths", "3 Tbsp. plus 1/4 c. vegetable oil, divided", "9 eggs, separated", "1 tsp. salt or to taste", "1 tsp. pepper or to taste", "1/4 tsp. chili powder", "1/2 tsp. ground nutmeg", "1/2 c. matzo meal (may substitute dried bread crumbs for matzo meal)"]
["In a food processor, mince garlic.", "Finely chop half of the onions.", "Remove.", "Chop remaining onions.", "Remove."]
["garlic", "onions", "vegetable oil", "eggs", "salt", "pepper", "chili powder", "ground nutmeg", "matzo meal"]