Using a melon corer, scoop balls out of apples. Try to leave a little skin on top of the ball. You should be able to get about 6 balls out of each apple.
Cut a drinking straw into three equal pieces. Push each straw piece into the tops of the apple balls, where the skin is showing.
Melt candy melts either in microwave according to package instructions or in Wilton Candy Melts Melting Pot.
Place Heath Bar crumbles in a small bowl.
Before dipping apple balls into candy melts, blot with a paper towel to soak up excess moisture. Apple balls should be as dry as possible before dipping into candy melts.
Dip apples into candy melts, rotating until fully coated, making sure the skin at the top is still showing.
Dunk coated apples into toffee crumbles and place apples on a sheet of waxed or parchment paper to dry.