Preheat grill to medium-high heat (350° to 400°). In a large skillet, melt butter over medium heat
Whisk in flour, and cook, whisking constantly, for 2 minutes
Gradually whisk in milk, and cook, whisking occasionally, for 8 minutes or until thickened and bubbly
Stir in horseradish, garlic salt, and pepper
Remove from heat, and stir in mozzarella until melted. Spread half of the cheese sauce on the cooked side of each Grilled Pizza Crust, and top with potatoes, bacon, remaining cheese sauce, and Cheddar. Return pizzas to grill, and grill over indirect heat, covered with grill lid, for 7 to 10 minutes or until cheese is melted and bottom of crust is browned
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