Everyone will want to eat the sweet and crunchy breadcrumbs on this Baked Ham with Crumb Topping, so you might close the kitchen door until it’s ready to serve. It’s all too tempting to nibble on the toasted bits, especially when you’re hungry.
Line rimmed baking sheet with aluminum foil; set wire rack in sheet. Place 12-inch square of foil in center of rack. Set ham on foil, flat side down, and cover it with oven bag, tucking bag under ham to secure it. Let ham sit at room temperature for 1 1/2 hours.
Adjust oven rack to lowest position and heat oven to 325 degrees. Bake ham to 100 degrees, about 2 hours. (Lift bag to take temperature; do not puncture.)
Meanwhile, combine sugar, brown mustard, vinegar, dry mustard, ginger, and cloves in medium saucepan and bring to boil over medium-high heat. Reduce heat to medium-low, and simmer until reduced to 3/4 cup, 15 to 20 minutes. Let cool while ham cooks.
Combine panko, parsley, oil, salt, and pepper in bowl. Remove ham from oven, discard oven bag, and let ham cool for 5 minutes. Increase oven temperature to 400 degrees.
Brush ham all over with brown sugar-mustard mixture. Press panko mixture against sides of ham to evenly to coat. Bake until crumbs are deep golden brown, 20 to 30 minutes. Transfer ham, flat side down, to carving board and let rest for 30 minutes. Carve and serve.