Preheat oven to 425°. Spray a 15x10x1-in. baking pan with cooking spray. Arrange sausages in pan and bake until heated through, about 10 minutes. Cool sausages slightly. Remove to a cutting board; cut into ½-in. slices. Wipe any excess oil from pan with a paper towel.
Meanwhile, in a large bowl, whisk together flour, brown sugar, baking powder, pie spice, baking soda and salt. In a separate bowl, whisk together buttermilk, sweet potatoes, eggs, butter and vanilla; stir in shredded apple.
Pour buttermilk mixture into flour mixture and stir until just combined. Stir in half the sliced sausages. Spread batter into same baking pan; top with remaining sausages. Bake until pancake is set, 12-15 minutes. Cut into 8 pieces and serve with maple syrup and butter.
Recipe by 5* trending recipes with videos at https://food.theffeed.com/2024/02/14/apple-and-sausage-sheet-pan-pancakes/