Combine mustard and honey; spread 1 tablespoon on each muffin half. In a large skillet, melt butter. Add Canadian bacon and heat through; remove to paper towels to drain. Cook apple slices in the drippings until tender. Arrange bacon on muffins; top with apple slices. Place on a baking sheet.
In a bowl, beat egg whites until stiff peaks form. Fold in cheese and paprika; spread over apples. Broil muffins until puffed and golden brown.
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