The term BRITTLE INGREDIENT can be solved by two crossword solutions: ALMOND (6 letters) and OATS (4 letters). Almonds are a type of tree nut that is widely used in baking and cooking. They are often used to make brittle, a type of candy made from sugar and nuts. OATS are a type of cereal grain that is also used in baking and cooking. OATS are often used to make granola and oatmeal cookies, but they can also be used to make brittle.