Prepare the Pretzel-Peanut Butter Base: In a large mixing bowl, combine the crushed pretzels, creamy peanut butter, powdered sugar, melted unsalted butter, and vanilla extract. Mix thoroughly with a sturdy spatula or your hands until all ingredients are well combined and a thick, cohesive mixture forms. The mixture should be sticky but firm enough to hold its shape.

Shape the Clusters: Line a baking sheet with parchment paper or wax paper. Using a tablespoon or a small cookie scoop, scoop out portions of the pretzel-peanut butter mixture. Roll each portion gently between your palms to form a rough ball or press it into a small, irregular cluster shape. Place the formed clusters onto the prepared baking sheet, leaving a small space between each.

Chill the Clusters: Once all clusters are formed, place the baking sheet in the refrigerator for at least 15-20 minutes. This chilling step is crucial as it helps the clusters firm up, making them easier to coat in chocolate and preventing them from falling apart.

Melt the Chocolate: While the clusters are chilling, prepare your chocolate coating. In a microwave-safe bowl, combine the chocolate chips and optional coconut oil. Microwave on high in 30-second intervals, stirring well after each interval, until the chocolate is completely melted and smooth. Alternatively, you can melt the chocolate using a double boiler over simmering water, stirring constantly until smooth. Ensure no water gets into the chocolate.

Coat the Clusters: Remove the chilled clusters from the refrigerator. One by one, carefully drop each cluster into the melted chocolate. Use a fork or a dipping tool to fully submerge and coat the cluster. Lift the cluster out, tapping the fork gently against the side of the bowl to allow any excess chocolate to drip off.

Garnish and Set: Immediately transfer the chocolate-coated cluster back to the parchment-lined baking sheet. While the chocolate is still wet, sprinkle a few chopped roasted peanuts and a pinch of flaky sea salt over the top of each cluster. Repeat this process for all remaining clusters.

Chill to Set: Once all clusters are coated and garnished, return the baking sheet to the refrigerator for another 30-60 minutes, or until the chocolate coating is completely set and firm to the touch.

Serve and Enjoy: Once fully set, carefully remove the clusters from the parchment paper. Serve immediately or store for later enjoyment.