Spudnuts (Glazed Yeast Doughnuts)

Ingredients

• 1 (0.25oz) package (7g) or 2 1/4 teaspoons Platinum Yeast
• 1 1/2 cups warm water (120-130°F)
• 1 cup mashed potatoes (warm, not hot)
• 2/3 cup granulated sugar
• 2/3 cup shortening
• 2 large eggs
• 1 1/2 teaspoons table salt
• 6 to 7 cups all-purpose flour
• 1 quart vegetable oil (for frying)
• 1 1/2 cups powdered sugar (sifted)
• 3-4 tablespoons milk
• 2 teaspoons vanilla