Heat the oven to 350°F and grease and line two 8-inch round cake pans.
Whisk flour, sugar, baking powder, and salt in a bowl.
Whisk milk, oil, eggs, and vanilla separately, then stir into the dry ingredients until just combined.
Divide batter between pans and bake 30 to 35 minutes, until the centers spring back and a tester comes out clean.
Cool cakes completely, place one layer on a plate, spread with frosting, add the second layer, and frost the top and sides.
Decorate with pastel candies in a simple bunny-garden design and chill briefly before slicing.