Easter Surprise Cake

Preheat oven to 350 degrees F. Prepare pound cake batter according to package instructions. Coat a 2-cup oven-safe measuring cup with cooking spray and pour in cake batter. Bake until golden and a toothpick comes out clean, 25 to 30 minutes. Let cool slightly. Repeat step 2 for second cake. Cut tops of each cake, then carve out the middle, leaving a 1/2-inch border so the cake still stands when hollowed out. (Be careful not to carve too deep.) Fill bottom cake with Easter candies (such as foil-wrapped chocolates). Frost ring around the top of the bottom cake. Place top cake on top of bottom cake and frost completely. Decorate egg with sugar pearls.