In a large mixing bowl, beat together pumpkin puree, maple syrup, and pumpkin pie spice until smooth. Set aside.
In another large mixing bowl, whip cold heavy whipping cream, maple syrup, and a pinch of salt until stiff peaks form, creating whipped cream.
Gently fold the whipped cream into the pumpkin mixture until light, fluffy, and evenly orange.
Divide the mixture into 6 clean 4-oz. containers or glass mason jars, adding about 2.5 tablespoons to each jar.
Prepare the chocolate topping by microwaving chocolate chips and coconut oil in 30-second intervals until melted and smooth. Stir in crushed pretzels.
Spoon 1-1.5 tablespoons of melted chocolate onto each jar of mousse, ensuring it covers the top evenly. Sprinkle with sea salt.
Chill the jars in the fridge for 10-15 minutes until the chocolate sets.
Serve and enjoy! Use a spoon to gently tap the chocolate to break it before scooping out the dessert.