Heat oven to 350°F Cut loaf into 10 (1-inch) slices almost to bottom crust.
Combine butter, poppy seed and garlic salt in small bowl; mix well. Brush cut-sides of bread with butter mixture.
Place 1 slice cheddar and 1 slice Monterey jack cheese in each cut; sprinkle with parsley.
Wrap loaves loosely in heavy-duty aluminum foil; seal top and ends.
Bake for 25 to 30 minutes or until heated through and cheese is melted.
Grilling Directions: Prepare bread as directed above. Prepare grill placing coals to one side; heat until coals are ash white. Place bread on grill opposite coals. Cover; grill until heated through and cheese is melted (25 to 30 minutes).