In a large skillet over medium-high heat, brown the ground pork, breaking it up into pieces with a spoon as it cooks, about 8-10 minutes. When the pork has reached 145ºF and is no longer pink, reduce heat to medium. Sprinkle half of the flour over pork and stir to combine. Add remaining flour and stir to combine. Add one cup of milk to the pan and stir. Continue to add milk one cup at a time as gravy thickens. Cook for another 5-8 minutes to further thicken the gravy.
Preheat oven to 350ºF. Grease a 9x13 pan with olive oil spray and set aside. In a large bowl, add eggs and 21 Seasoning Salute and whisk to combine; set aside. Open the biscuits and tear each biscuit into four pieces. Line the bottom of the greased pan with half of the biscuit dough. Pour egg mixture on top of biscuit dough. Sprinkle cheese evenly atop egg mixture. Pour sausage gravy over egg mixture and top with remaining biscuit dough pieces.
Insert pan in oven and bake for 20 minutes. Cover pan with foil and bake for another 12-15 minutes. Remove from oven and allow to cool slightly before serving.