In large mixing bowl, combine 1 cup sugar and oil; using an electric mixer on medium speed, beat until well combined.
Beat in eggs one at a time; add in water and vanilla, beating until creamy. Gradually add in flour and baking powder.
Pour ½ of the batter into the bottom of a greased 9x13-inch baking pan. Spread pie filling over batter; dot with remaining batter.
Combine remaining 1/3 cup sugar and cinnamon; sprinkle over the top of the batter. Bake in a preheated 325°F oven until knife inserted in center of cake comes out clean (about 50 minutes).
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