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1
Preheat oven to 350 degrees.
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2
Coat bottoms of 2 (9-inch) round cake pans with cooking spray (do not coat sides of pan), and line bottoms of pans with wax paper. Coat wax paper with cooking spray, and dust with 1 tablespoon flour.
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3
Combine water and oats in a medium bowl; let stand 20 minutes. Beat granulated sugar, brown sugar, shortening, and vanilla at medium speed of a mixer for 5 minutes. Add eggs, 1 at a time, beating well after each addition. Add oatmeal, beating until blended.
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4
Lightly spoon 1-1/2 cups flour into dry measuring cups; level with a knife. Combine 1-1/2 cups flour, baking soda, cinnamon, salt, and nutmeg, stirring well with a whisk. Add flour mixture to sugar mixture alternately with buttermilk, beginning and ending with flour mixture.
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5
Pour batter into prepared pans. Sharply tap pans once on counter to remove air bubbles. Bake at 350 degrees for 35 minutes or until a wooden pick inserted in center comes out clean. Cool in pans 10 minutes on a wire rack; remove from pans. Remove wax paper. Cool completely on wire rack.
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6
Place 1 cake layer on a plate; spread layer with 1/2 cup Caramel-Pecan Frosting, and top with the remaining layer. Spread the remaining frosting over the top and sides of cake. Store the cake loosely covered in refrigerator.
