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Preheat oven to 350 degrees.
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Melt butter in a 10 inch ovenproof skillet or a 9x9 inch square pan. Sprinkle brown sugar over melted butter. Arrange peach slices on brown sugar.
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Beat remaining ingredients with electric mixer on low speed for 30 seconds, scraping bowl. Beat on high for 3 minutes, scraping bowl occasionally. Pour over peaches.
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Bake for 45-50 minutes in skillet or 50-55 minutes in square pan. (or until toothpick inserted in middle comes out clean.)
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Immediately turn cake upside down onto a heatproof plate. Let skillet or pan remain over cake a few minutes so brown sugar topping can drizzle over cake. Cool for 15 minutes before serving.