Preheat the oven to 400 degrees. Spray a large baking pan with nonstick spray coating. Arrange the pretzels in the pan.
In a small bowl, stir together the prepared mustard, honey, vinegar, and dry mustard. Slowly pour the mixture over the pretzels, stirring to coat.
Spread out the pretzels so that they are in 1 or 2 layers. Bake for 8 to 10 minutes, stirring once, or until the pretzels begin to brown.Cool in the pan on a wire rack until they begin to crisp. The pretzels will keep at room temperature for 1 to 2 weeks.