Preheat oven to 450 degrees. Spray standard 12-cup muffin pan with nonstick cooking spray, then brush with melted butter. Place in oven until very hot, about 10 minutes. Combine milk, next 6 ingredients and 2 tablespoons butter in a large bowl; whisk until blended. Remove hot muffin pan from oven. Divide batter equally among muffin cups. Sprinkle with chopped pecans.
Bake popovers 15 minutes. Reduce oven temperature to 350 degrees and continue to bake until brown and firm, about 15 minutes longer. Brush popovers with 2 tablespoons butter; sprinkle with salt. Turn out of pan, cutting to loosen if necessary; serve immediately.
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