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Preheat oven to 400 degrees F. Coat a 9x13 casserole dish with nonstick cooking spray; set aside.
In a medium nonstick skillet, heat butter over medium-high. Add onion and saute until tender and translucent, about 3 minutes. Remove from the skillet and stir in the sour cream, mayonnaise, cheese, and spices until melted and combined. Set aside.
Press all 8 biscuits flat into the prepared pan, pinching the seams together until they completely cover the bottom of the pan, pushing the dough slightly up the sides to form a rim. (The layer of dough will be thin.)
Arrange tomato slices over the biscuit dough. Spread the cheese mixture over the top. Sprinkle with a little paprika.
Bake for 25-27 minutes until the dough is cooked through, tomatoes are tender, and the cheese mixture is nice and bubbly.
Let stand 10 minutes before cutting.