Maple-Walnut Sticky Buns

Ingredients (15)

• 1 package (1/4 ounce) active dry yeast
• 1 cup warm water (110° to 115°)
• 1/2 cup mashed potatoes (without added milk and butter)
• 1 large egg, room temperature
• 2 tablespoons shortening
• 2 tablespoons sugar
• 1 teaspoon salt
• 3 to 3-1/2 cups all-purpose flour
• TOPPING:
• 1 cup maple syrup
• 3/4 cup coarsely chopped walnuts
• FILLING:
• 1/3 cup sugar
• 1-1/2 teaspoons ground cinnamon
• 3 tablespoons butter, softened