I watched a video on the Food Network by Paula Deen for this recipe. But when I searched the recipes for this it was different than what she did in the video. So here is my guess at the amounts she used in the video.
In a large skillet over medium-high heat, saute onion in 2 tablespoons butter. Add beef and cook until browned, add the gravy to heat up. Season with salt and pepper, to taste. Set aside.
Combine biscuit mix and 1 1/2 cups of milk. The mix should be thinner than that of normal biscuit mix but not runny.
3Spray a 9 by 9 by 2-inch pan (or any similar casserole dish) with cooking spray. Layer mashed potatoes halfway up the sides of the dish. Next, spread a layer of corn or mixed vegetables on top of the potatoes. Then add the layer of meat and gravy. Pour the biscuit mix over the meat. Melt 4 tablespoons of butter and drizzle over top. Bake for approximately 35 to 45 minutes or until top is golden brown. Let stand for a few minutes before serving.