Break the egg into bowl, mix in the sour cream, mustard and beer. Grate the cheddar into the cheese paste and whisk it well to combine.
Cut the country bread into one-inch thick slices. Press the interior with hand, so that the bread remains slightly cup-like. Place the loaves on a buttered baking sheet on oven tray.
Brush the bread with chutney. Spoon the cheese mixture on bread, edge to edge. Place the loaves in the top of the oven and bake them for 10-12 minutes until the cheese bubbles and browns. Allow to cool for a while after the oven.
Drizzle Worcestershire sauce over the top. Garnish the warm Welsh rarebits with a sprig of parsley.
Notes
If you want a denser filling for your Welsh Rarebits, add crispy fried bacon cubes.