Add 3 Tbsp Bacon Grease & 2 Tbsp Butter to a cast iron skillet. Melt over medium heat. Whisk in 4 Tbsp of Flour. Cook flour 5 mintues on medium. Remove from heat. Whisk in Milk. Stir until thickened. Sauce will resemble gravy. Remove the sauce from the heat
Slice your potatoes evenly & arrange into skillet on top of cream sauce. Salt & pepper the potatoes. Cover with Foil.
Bake 350 degrees for 30 mintues. Remove Foil & top with cheese if desired. Bake 350 degrees another 30 mintues or until potatoes are fork tender & cheese is melted, browned and bubbly. Top with fresh chives (optional). Enjoy!