Dān Bǐng (蛋饼) is the Taiwanese egg crepe, a thin wheat batter crepe griddled with an egg pressed into it, then rolled up and sliced, a fixture of the island's breakfast counters. The angle is the marriage of crepe and egg into a single supple sheet. The whole point is not a crepe served with egg but an egg cooked directly onto the crepe so the two set together into one flexible layer that rolls cleanly and holds a filling. Get it right and you get a tender, slightly chewy roll with a soft egg laced through it; get it wrong and you get a crepe that is either gummy and raw in the middle or fried so hard it cracks instead of rolling.
The build runs off the griddle in one continuous move. A thin wheat-flour batter, sometimes with a little tapioca or sweet potato starch for chew, is poured and spread into a round on a flat oiled griddle and cooked until just set. A beaten, seasoned egg is poured over the crepe, or the crepe is flipped onto the egg, so the two fuse across the whole face. While the egg is still soft the sheet is rolled up into a loose cylinder, then cut crosswise into bite-length pieces and served with a sweet soy-based sauce or chili to spoon or drizzle over. Good execution shows a crepe that is thin and pliable with a faint chew, an egg that is fully set but still tender and bonded across the surface, and a roll that holds its shape under the knife without falling apart. Sloppy work shows up quickly: batter spread too thick so the center stays doughy, an egg overcooked to a dry, rubbery sheet that peels away, or a griddle too cool so the crepe soaks oil and turns greasy and limp.
It shifts mostly by what goes in before the roll and by the sauce. The plain version is just crepe and egg with the sweet soy drizzle; common additions rolled inside are cheese, corn, scallion, a pork or chicken floss, basil, or a slim sausage. Some shops finish it crisp at the edges, others keep it soft throughout, and the dipping sauce ranges from sweet and dark to sharply chili-hot. The same crepe taken with bacon folded in is its own preparation and gets its own treatment. What keeps dān bǐng its own entry is the egg griddled into a thin wheat crepe and rolled, the breakfast-counter form that defines it across Taiwan.