Country Ham and Cheddar Pretzel Bites with Jalapeño Mustard

1/2 teaspoons active dry yeast

2 tablespoons plus 1 teaspoon packed light brown sugar , divided

1/4 cup warm water (110-115 F)

1 cup warm milk (110-115 F)

2 

1/2 to 3 cups all-purpose flour

1/2 cup finely chopped country ham (3 oz; preferably Newsom's or Benton's), divided

1/3 cup finely chopped sharp Cheddar , divided

6 cups water

4 teaspoons baking soda

1/2 cup Dijon mustard

2 tablespoons finely chopped seeded fresh jalapeños

1 tablespoon mild honey

1/2 stick unsalted butter , melted

1 to 2 tablespoons pretzel salt or coarse salt