Line a mini muffin pan (or a normal muffin pan) with paper liners or use silicone pans.
Prepare the oat cookie layer by mixing all oat layer ingredients until they form a thick dough.
Scoop ~1.5 teaspoons of the oat mixture into each muffin cup, pressing firmly to create a smooth top. Freeze for about 15 minutes.
Prepare the peanut butter caramel layer by mixing all ingredients until combined. Spread about 1 teaspoon over the oat layer and freeze for another 15 minutes.
Melt chocolate chips and coconut oil for the chocolate layer, then spread evenly over the caramel layer. Freeze for 10 minutes.
For the chocolate drizzle, melt chocolate chips and coconut oil, then drizzle over each cup in a twix zig-zag pattern. Freeze until set.
Once set, remove cups from the pan and store them in a freezer-safe bag.