- 2 (.25 ounce) packages active dry yeast
- 1/2 cup warm water (110 degrees F to 115 degrees F)
- 2 cups warm milk (110 to 115 degrees F)
- 1 cup mashed potato flakes
- 2/3 cup shortening
- 1/2 cup sugar
- 2 eggs, lightly beaten
- 1 teaspoon salt
- 3 cups whole wheat flour
- 3 cups all-purpose flour
- FILLING:
- 3 tablespoons butter or margarine, softened
- 2/3 cup packed brown sugar
- 2 egg yolks
- 2 tablespoons milk
- 1/4 teaspoon vanilla extract
- 2 cups finely chopped hazelnuts
- In a large mixing bowl, dissolve yeast in warm water. Add the milk, potato flakes, shortening, sugar, eggs, salt, whole wheat flour and 1 cup all-purpose flour; beat until smooth. Stir in enough remaining all-purpose flour to form a stiff dough. Turn onto a floured surface; knead until smooth and elastic, about 6-8 minutes. Place in a greased bowl, turning once to grease top. Cover and let rise in a warm place until doubled, about 1 hour. Punch dough down. Turn onto a lightly floured surface; divide in half. Roll each portion into a 14-in. x 9-in. rectangle.
- For filling, in a small mixing bowl, beat butter, brown sugar and egg yolks until creamy. Add milk and vanilla; mix well. Stir in hazelnuts. Spread over dough to within 1/2 in. of edges. Roll up jelly-roll style, starting with a short side; pinch seams to seal. Place seam side down in two greased 9-in. x 5-in. x 3-in. loaf pans. Cover and let rise in a warm place until doubled, about 30 minutes. Bake at 375 degrees F for 15 minutes. Cover with foil. Bake 20-25 minutes longer or until golden brown. Remove from pans to wire racks to cool.