Heaped is used about a spoon in cooking. A heaped spoonful is as much as the spoon can hold, piled up above the edge, not scraped flat. If a recipe says a heaped teaspoon of sugar, it wants a little hill on the spoon, so you get more than a level spoon. Though actually, this is especially a British way of talking. American recipes often say a heaping teaspoon instead — same idea, different word. You can also hear a heaped plate, meaning food piled high, but the meaning you need here is the spoon. It is a small, practical word from home kitchens and recipe books, not from formal writing.