- 1 ½ cup all-purpose flour
- ¾ cup rainbow sprinkles (jimmies) plus more for decorating
- 1 ½ teaspoon baking powder
- ¾ teaspoon fine sea salt
- 6 eggs separated
- 1 cup granulated sugar
- 1 ½ teaspoon vanilla bean paste or two teaspoons vanilla extract
- 1 teaspoon dark rum or brandy or bourbon whiskey
- 1 cup whole milk divided
- 14 ounces sweetened condensed milk
- 12 ounces evaporated milk
- 1 ½ cup heavy cream
- ¼ cup powdered sugar plus one tablespoon
- 1 teaspoon vanilla bean paste or vanilla extract
- ⅛ teaspoon fine sea salt
- You can make this cake vegan by substituting plant-based milks, vegan egg alternatives, and coconut cream for the heavy cream. This recipe also scales well for two cake rounds or a dozen tres leches birthday cupcakes instead of a single 9 x 13-inch pan. Store the cake refrigerated with plastic wrap or a sealed lid for up to five days for best freshness. To freeze, cool fully before wrapping tightly in plastic and foil; thaw overnight in the fridge before soaking with the milk mixture.