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Flapjack
UK Snack
In the UK, 'flapjack' refers to a sweet, chewy oat square, distinctly different from a pancake. 
Not Pancakes
Don't confuse UK flapjacks with pancakes when in a British context; they are quite different foods. 
Customizable Treat
In the UK, flapjacks can include various added ingredients, like nuts or chocolate chips. 