1cupall-purpose flour(King Arthur GF Measure for Measure)
1t dry mustard
1/2tsalt
Instructions
Preheat the oven, grease the pan, and prepare the filling - Preheat your oven to 400℉, convection bake setting. Grease the popover pan. Shred the ham and grate the cheese.
Make the popover batter - Melt the butter in your microwave. Add the eggs, butter, and milk to your blender jar and blend until combined. Separately, whisk the flour, mustard, and salt together, then add the flour mixture to the blender with the egg mixture. Blend until the batter is completely smooth.
Assemble the popovers and bake - Pour 1/4 cup of batter into each popover cup. Drop some shreds of ham into the batter and then top with a bit of cheese. Distribute the rest of the batter among the six cups. Bake for 18 minutes on the bottom rack of your oven, then reduce the oven temperature to 350℉ and bake an additional 8 minutes.
Finish - Remove the popovers from the oven. Immediately prick each popover to allow the steam to escape, and let them rest for 5 minutes. Remove from the pan and serve right away.