Step 1

Preheat the oven to 350 degrees Fahrenheit. Grease a 9x13-inch baking pan with butter or baking spray.

Step 2

Make the cake batter: In a large bowl, beat cake mix, eggs, milk, softened butter, and vanilla on low speed for 30 seconds. Increase speed to medium and beat for 2 more minutes.

Step 3

Pour batter into the greased pan. Bake for 30 to 35 minutes, or until a toothpick inserted into the center comes out clean. Let the cake cool in the pan for 20 minutes.

Step 4

While the cake is cooling, prepare the milk mixture. In a 4-cup measuring glass with a spout, whisk together sweetened condensed milk, evaporated milk, and 1 cup whipping cream.

Step 5

Poke holes in the cake using a knife or skewer. Pour milk mixture over the cake. Let the cake cool further for 30 minutes.

Step 6

Cover the cake with plastic wrap and refrigerate for 4 hours or overnight.

Step 7

For the topping, beat 1 cup whipping cream until it starts to thicken. Gradually add the powdered sugar and vanilla and continue to beat until soft peaks form, about 1-2 minutes.

Step 8

Spread whipped cream over the cake right before serving. Enjoy!