Preheat oven to 375°F and grease a 13x18x1" half sheet pan.
Brown 1 lb bulk breakfast sausage and drain off any excess grease. Set aside to cool.
In a large bowl, mix together 4 cups all purpose flour, ½ cup light brown sugar, 1 Tablespoon baking powder and ½ teaspoon salt.
Add 2½ cups milk, 4 large eggs, ¼ cup vegetable oil and 2 teaspoons vanilla extract. Stir until just combined.
Mix in browned sausage and pour into greased sheet pan.
Bake 25-30 minutes or until set and lightly golden brown.
Let set for 5 minutes, then cut into pieces and serve with maple syrup or your favorite pancake toppings.
Notes
Storing leftovers: If your family can't put down an entire 13x18" pancake in one sitting, don't despair. This recipe stores and reheats well. Leftover slices can be stored in an airtight container in the refrigerator for a few days. For longer storage, layer pieces with wax paper in between and freeze for up to three months. Either way, you can have fresh hot pancakes in almost no time. Just pop a slice on a plate and microwave it for thirty to forty-five seconds and enjoy.