Preheat the oven to 450°F. Position a rack on a lower shelf.
Grease a standard 12-cup metal muffin tin thoroughly.
Use a wire whisk to beat together the eggs, milk, and salt until well combined.
Add the flour all at once, and beat with a wire whisk till frothy.
Stir in the melted butter, combining quickly.
Pour the batter into the muffin cups, filling them about ⅔ to ¾ full.
Bake the popovers for 20 minutes without opening the oven door.
Reduce the heat to 350°F and bake for an additional 10 to 15 minutes, until they're a deep, golden brown.
While the popovers are baking, prepare the sweet butter by mixing the softened butter, salt, and honey or maple syrup until combined.
If serving immediately, remove the popovers from the oven, release steam by sticking a knife into the top of each, and serve alongside the sweet butter.
