Line a large rimmed baking sheet with parchment paper.
Melt chocolate chips with 1 tablespoon coconut oil in the microwave in 30-second intervals, stirring between each, until smooth and glossy.
Stir 1 tablespoon coconut oil into the peanut butter until smooth and fluid. Warm 15 seconds if needed.
Pour melted chocolate onto the parchment and spread into an even layer 3 to 4mm thick.
Drop spoonfuls of warmed peanut butter over the chocolate surface. Swirl with a toothpick or knife tip in long sweeping strokes to create ribbons. Do not over-swirl.
Immediately scatter chopped peanuts, almonds, coconut flakes, and any toppings over the wet surface. Press gently to adhere. Finish with a generous scatter of flaky sea salt.
Freeze for a minimum of 2 hours until completely solid.
Remove from the freezer, break into irregular pieces immediately, and transfer to an airtight container lined with parchment between layers. Store in the freezer.