Melt butter and pour into 9-inch round cake pan; sprinkle with Splenda brown sugar. Drain peaches, reserving 6 tablespoons of juice. Arrange peaches, cut side down, in a single layer over the sugar. Sprinkle coconut over the peaches.
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In a bowl, beat eggs; gradually add in white Splenda. Add vanilla and reserved juice. Combine flour, baking powder and salt and add to egg mixture and mix well. Pour over peaches.