6 medium sweet-tart apples, such as Braeburn, Fuji, or Gala
1 pound semisweet chocolate, cut into chunks
1 cup M & M's, chopped pistachios, shredded coconut, toffee pieces, or crushed Oreos
Twist off the stems from the apples and push a Popsicle stick down into the core. Put the apples in the fridge while preparing the chocolate; they'll coat better if they're cold.
Slowly melt the chocolate in a double boiler over hot water or in a microwave set on high for 2 minutes, stirring halfway through the heating time to smooth it out. Remove from the heat and stir until completely melted and warm, not hot. Dunk each apple into the chocolate, allowing the excess to drip back into the bowl. Roll the apples around in the chocolate, turning with the stick, so it's coated all the way up to the top. Use a spoon to baste any hard to get spots.
Put the desired coating in a separate bowl and roll the dipped apple around so it is completely covered. Set the chocolate dipped apples on a cookie sheet lined with wax paper. Refrigerate until the chocolate is set.