Step 1

Heat oven to 350°F (325°F for dark or nonstick pan). Grease 13x9-inch pan with shortening or cooking spray. In large bowl, beat all cake ingredients with electric mixer on low speed 30 seconds, then on medium speed 2 minutes, scraping bowl occasionally. Pour batter into pan.

Step 2

Bake 28 to 32 minutes or until toothpick inserted in center comes out clean. Cool 10 minutes. Poke top of cake every 1/2 inch with wooden skewer.

Step 3

In medium bowl, mix Tres Leches ingredients. Spoon mixture evenly over top of cake, allowing mixture to soak into holes. Cover; refrigerate 1 to 2 hours or until mixture is absorbed.

Step 4

In chilled medium bowl, beat whipping cream, powdered sugar and 1 teaspoon vanilla with electric mixer on high speed until soft peaks form. Frost cake with whipped cream; sprinkle with chocolate shavings. Store covered in refrigerator.