1. Preheat oven to 450 degrees F. Spray the cups of a 6-cup popover pan with nonstick cooking spray. Pour 1/2 teaspoon of the melted butter into each cup.
2. In a bowl, whisk together the eggs and milk, then whisk in the remaining 2 tablespoons butter. In a large bowl, whisk together the flour and salt, then whisk in the egg mixture. Whisk vigorously until smooth, about 2 minutes. Divide the batter among the prepared cups and bake for 20 minutes
3. Reduce the heat to 325 degrees F and bake for 15 minutes more. Remove from the oven and invert the pan onto a wire rack.
4. Let the pan cool, then spray the cups with nonstick cooking spray. Pour 1/2 teaspoon of the melted butter into each one and bake the remaining batter. Serve immediately with butter and jam.
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