Swiss Onion Bread

Our granddaughter, Lena, used this recipe as part of her 4-H project, and it was very well received. The slight crunch from poppy seeds pairs well with the creamy Swiss cheese.32 ServingsPrep: 30 min. + rising Bake: 25 min.
Ingredients
- 2 packages (1/4 ounce each) active dry yeast
- 1-1/2 cups warm water (110° to 115°), divided
- 1 teaspoon plus 1/4 cup sugar, divided
- 1/2 cup butter, melted
- 1 medium onion, finely chopped
- 1 egg
- 2 teaspoons salt
- 1/4 teaspoon ground mustard
- 6-3/4 to 7-1/4 cups bread or all-purpose flour
- 3/4 cup shredded Swiss cheese
- FILLING:
- 3/4 cup finely chopped onion
- 1/4 cup shredded Swiss cheese
- 3 tablespoons butter
- 1 tablespoon poppy seeds
- 1 teaspoon paprika
- 1/2 teaspoon salt
- EGG WASH:
- 1 egg yolk
- 2 teaspoons water
- Additional poppy seeds, optional
Directions
- In a large bowl, dissolve yeast in 1/2 cup warm water. Add 1 teaspoon
- sugar; let stand for 5 minutes. Add the butter, onion, egg, salt,