Ok here goes:
5) Reeses Peanut Butter Cups - I used to love the originals, because the combination of peanut butter and chocolate is second to none. Remember the original commercials on how one dipped into the other? Now, you see how there have been various iterations and versions, like crunchy cups and candies built into the cups. The shirt end of the stick? They seemingly get smaller for the stationery ever climbing price of $1.25, so I look for the .69 and .89 bargain prices in CVS and Walgreens.
4) Take 5 - Equally as impressive as the peanut butter and chocolate combination is the nuts and pretzels covered in milk chocolate. This bar just recently returned to the market after making it's underrated debut several years ago and the quality in taste just improved from there.
3) Twix- Milk chocolate, caramel, and a crunchy cookie has been a classic for decades. Love even more the harder to find peanut butter flavor, and they just came out with cookies and cream and green tea versions that are smaller but equally as delicious.
2) Hershey's with Almonds - Of course there are quite a few candy bars out there that combine chocolate with various types of peanuts. However this combination doesn't get any simpler than this, with milk chocolate and a generous serving of chunky almonds on the bottom of the bar. Excellent eaten out of the freezer as long as your teeth can handle it.
1- Krackel/ Nestle Crunch (tie) - Either way you crunch it, the pairing of milk chocolate and crisped rice tops my list here, whether it's Hershey's classic version which is also a renowned classic in miniatures, or Nestle's original which has stood the test of time. Also both excellent ice cold.
Honorable mentions: 5th Avenue, Snickers, Almond Joy, Milky Way, Baby Ruth, and Nutrageous.