In a small saucepan over medium low heat, melt butter

Stir in tahini, cinnamon, salt, and vanilla.

Add the chocolate chips and stir until the chocolate is fully melted. Remove from the heat.

In a large plastic bin or bowl with a lid, combine the chex and tahini mixture, stirring gently to keep the chex from breaking.

Stir in half of the powdered sugar and then add the rest of the powdered sugar and the sesame seeds, snap on the lid and shake!

Taste and add more powdered sugar as desired.

Fold in the chopped halva and M&M's and enjoy!