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In a small bowl, combine topping mix and set aside.
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In a medium bowl, combine the 3 dry ingredients and set aside.
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In a LARGE bowl (this makes a lot of batter), cream sugar and butter together.
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Add eggs and vanilla, mix well.
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Add sour cream, mix just until combined (no white streaks).
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Add dry ingredients, a third at a time. Mix well.
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Fold in 1/2 of topping mix.
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Pour into a greased 10x13 glass dish/pan (this will spill out if the dish is smaller than 10x13). You can make 2 smaller pans,.
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Sprinkle remaining topping mix evenly on top.
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Bake at 350 for 45-60 minutes.