Watermelon Layer Cake

unsalted butter (at room temperature (1/2 cup))

vegetable oil ((1/2 cup))

granulated sugar ((2 cups))

watermelon-flavored powdered gelatin (like Jell-O brand (from 1.5 standard boxes))

large eggs (at room temperature)

vanilla extract

all-purpose flour ((3 cups))

baking powder

salt

buttermilk ((1 1/2 cups))

Gel food coloring ((I used a mix of red, pink, and burgundy Americolor colors))

miniature chocolate chips ((1 cup))

pasteurized liquid egg whites ((3/4 cup) )

powdered sugar ((6 cups))

salt

unsalted butter (at room temperature (6 sticks, or 3 cups) )

vanilla extract

Gel food coloring (I used red, pink, burgundy, leaf green, and lemon yellow Americolor brand)

miniature chocolate chips ((1/2 cup))

vodka

Black fondant ((optional))