In a medium saucepan, add peanut butter, honey, and oil. Heat over medium heat - whisking occasionally. Bring to a boil - you will see little bubbles on the sides and maybe a spatter in the center. Whisk constantly for 2-3 minutes or until the mixture thickens and starts to pull away from the pan. This is how you know it's done.
Remove from heat. Whisk in vanilla.
Stir in crispy rice, gently.
Line a pan with parchment or wax paper. (I used an approx. 3 x 6 pan. Or, you can press into an 8 x 8 pan and just fill half of it for a thick treat, or press into the entire pan for a thinner treat. Or, press into a bread loaf pan. You decide!)
Allow to cool.
Melt chocolate in the microwave and coat the top. Allow to harden. (If you want to speed up the chocolate hardening process, put in the freezer for 10 minutes or so.)
Cut into 15 squares.