In a small bowl, beat together butter and honey with a mixer at high speed until light and fluffy. Transfer honey butter to a piping bag fitted with a large open star tip (Wilton #1M).
Place Marmite in a separate piping bag, and cut off a very small portion of the tip. Pipe a small button (approximately ¼ teaspoon) of Marmite into each phyllo cup. Sprinkle cheese crumbles over Marmite. Pipe a honey butter rosette into each cup, covering cheese.
Garnish with microgreens, if desired. Serve immediately or let sit at room temperature for up to 2 hours.
Recipe by TeaTime Magazine at https://teatimemagazine.com/marmite-and-cheese-honey-cups-recipe/