Combine first five ingredients. In a small bowl, beat eggs, water, oil vinegar and vanilla. Add to dry ingredients; beat until blended.
Pour into a greased and floured 9-in. round baking pan. Bake at 350° for 25-30 minutes or until a toothpick inserted in the center comes out clean. Cool for 10 minutes before removing from pan to a wire rack. Cool completely.
For frosting, whisk the flour and milk in a saucepan until smooth. Cook and stir over medium heat until thickened (mixture will be paste-like); cool. In a bowl, cream butter until fluffy. Gradually add sugar, beating well. gradually add cooled milk mixture; beat for 5 minutes or until light and fluffy. Add vanilla; mix well.
On waxed paper, draw two bunny ears, 5-1/2 in. tall and 2-1/4 in. wide; set aside. In a microwave or a heavy saucepan, melt candy coating; stir until smooth. Tint pink with red food coloring. Spread over bunny ear pattern's cool until firm. Carefully peel ears off waxed paper. For grass, place 1 cup coconut in a resealable plastic bag. Add 12 drops green food coloring; shake well.
To assemble, cut cake in half. Spread frosting over top of one cake half. Stack second half on top. Stand the cake by placing cut side down on a serving platter. Cut a wedge from one side of cake about 1 in. from cut side and about 2 in. deep to create head as shown in Fig. 1 below. Set wedge aside for tail.
Frost entire cake. Place tail on back of cake. Frost and cover with remaining coconut. Add chow mein noodles for whiskers, pink jelly beans for eyes and red jelly bean for nose. Place ears behind head as shown in photo. Spread grass around bunny.