Measure oats and salt and place in a large bowl.
In a microwave safe vessel combine nut butter, tahini, cocoa powder, maple syrup, vanilla, milk, and espresso.
Heat in 15 to 30 seconds intervals, stirring after each interval until ingredients are combined.
Pour chocolate mixture into the bowl with the oats and salt. Stir to combine.
Add chocolate chips and stir.
Line a metal baking dish either 8x8 or 8x12 with parchment paper. Spread batter evenly in pan, pushing down with your hands.
Sprinkle candy cane pieces on top. Then place a second sheet of parchment paper on top. Press down firmly to flatten the batter. (I like to place a heavy cookbook on the top piece of parchment paper and stand on it.).
Place baking dish in the freezer for 30 minutes. Remove from freezer and lift out of baking dish. Remove parchment paper. Use a serrated knife to cut into 16 bars. Store in freezer until ready to eat.