Line a baking sheet with parchment paper. Spread about 2 teaspoons of peanut butter on one Ritz cracker and top it with another cracker. Press lightly to form a sandwich. Repeat with all crackers to make 12 sandwiches.

Place the chocolate and vegetable oil in a microwave-safe bowl. Microwave at 50% power for 1 minute, stir, then heat in 30-second increments until smooth.

Use a fork to dip each peanut butter sandwich into the melted chocolate, coating it completely. Let excess chocolate drip off, then place the dipped sandwich back on the parchment paper.

If desired, sprinkle with a few sprinkles or some flaky sea salt on top before the chocolate sets. Allow the treats to cool for about 20 minutes, until the chocolate has hardened.