Preheat the oven to 425 degrees F. You will need a 12 well muffin pan.
Melt the butter in a small ramekin. Place 1/2 tsp of the melted butter into each muffin well and set aside.
In a blender or food processor, mix the eggs, milk, sugar, regular salt, and remaining butter until smooth.
Add the flour and mix for about 30-40 more seconds.
Place the muffin tin into the hot oven and heat for about 3 minutes and the butter is sizzling.
Using a ladle, pour enough mixture into each muffin well until it reaches about halfway up the sides.
Evenly sprinkle the chopped thyme on each popover and place back into the oven.
Bake for 20 minutes and then turn the oven down to 350 degrees F. Bake for a further 10-12 minutes before opening the oven door and taking them out.
Sprinkle each popover with sea salt while still hot.