Caramelized Onion and Swiss Popovers

• 2 cups all-purpose flour
• 1/2 tsp salt (preferably kosher)
• 2 tsp sugar
• 2 cups whole milk
• 6 fresh eggs
• 1/4 cup chopped caramelized sweet onions
• 1/4 cup freshly shredded Swiss cheese
• several dabs of butter
• a popover pan (or muffin pan if you don't have a popover pan)

1. Preheat oven to 425°F with pan (like a muffin tin) inside oven. Combine flour, salt and sugar thoroughly. In a separate bowl, combine milk and eggs.

2. Combine wet and dry ingredients. Stir in cheese and onions. Melt a dab of butter in each popover pan cup in the oven until it sizzles. Pour the batter into hot pan cups, 3/4 full.

6. Bake at 400°F for 15 minutes. Turn the oven down to 350°F and bake for 15 minutes. Remove and cool for 15 minutes. Serve warm.