Lemon Mousse Cakes in White Chocolate Shells

lemon (zested)

granulated sugar ((1.33 cups))

unsalted butter

vegetable oil

powdered lemon gelatin ((like Jell-O brand, not sugar-free))

eggs (at room temperature)

vanilla extract

lemon extract

all-purpose flour ((2 cups))

baking powder

salt

buttermilk (at room temperature)

white chocolate chips ((3 cups))

heavy cream ((3.5 cups))

salt

lemon extract

lemons (zested)

unflavored powdered gelatin

cold water

inches acetate cake collars ((3 tall and 3-inch cake collars)

yellow candy melts

white candy melts

fresh berries