That's a Nasturtium (Tropaeolum majus), identified by it'sits almost round leaves with the stems joining the leaves slightly off center, and the pronounced radial veins. Some cultivars are trailing and work well in hanging baskets, some are bushier and are useful in garden beds.
The seed is a light grey color, spherical and wrinkled; iti could see how it might be confused with a cilantro seed, though Nasturtium seeds are generally larger. Parsley seed is very different, being much smaller, striped and almost a crescent shape.
It's a flowering annual, with brightly colored flowers in a range in yellow, orange and red. Leaves and flowers are edible, with a flavor like watercress. They flower best if you don't fertilize it. They will also reseed themselves if allowed to.