A flapjack is a baked oat bar made primarily from rolled oats, butter, brown sugar, and usually golden syrup, cooked in a flat oven tin and cut into squares or rectangles. It is a sweet, chewy snack popular in the United Kingdom and differs from the American flapjack, which is another term for pancakes. British flapjacks can also include variations with nuts, dried fruit, or chocolate chips. They are commonly eaten as a snack, dessert, or breakfast item and are known for their simplicity and versatility.