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Heat oven to 350 degrees Fahrenheit.
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Grease and flour a 13 x 9 inch pan.
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For the batter, beat the Bisquick, sour cream, sugar, water, vanilla and eggs in a large bowl of electric mixer at low speed for 30 seconds, scraping side and bottom of bowl frequently.
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Beat on medium speed 4 minutes.
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Pour batter into pan.
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Bake 35 to 40 minutes or until cake tests done.
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For the topping, combine the sour cream and brown sugar; fold in strawberries.
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Spread topping over warm cake.
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Store in refrigerator.