Bake the brownies according to the package instructions. Cool for 15 minutes, then use a fork to crumble the brownies. Spread the crumbs on a baking sheet and refrigerate until completely cool.
While the brownies cool, prepare the pudding layer. In a large bowl, add the pudding mix, cocoa powder, heavy cream, and milk. Whip until light and fluffy.
Crush the Oreo cookies into fine crumbs using a food processor or a zip-top bag. A food processor creates an even crumb, or crush the cookies in a zip-top bag.
Place plastic cups or small mason jars on a baking sheet. Add a layer of cooled brownie crumbs to the bottom of each cup (¼ cup), followed by a spoonful of the pudding mixture (about ⅓ cup).
Sprinkle with crushed Oreos (¼ cup) and a handful of candy rocks, then top with gummy worms.
Refrigerate for 15 to 30 minutes before serving.
Notes
Note 1: Use your favorite boxed brownie mix. Gluten free brownie mix will work too! Note 2: Find a gluten free instant pudding mix if making this for someone who is celiac. For someone with a gluten intolerance the standard “Jello” instant pudding will be fine. Note 3: If lactose is an issue use lactose free heavy cream. Note 4: Use anything but skim milk. Lactose free works, even unsweetened almond milk will work. Note 5: Use gluten free Oreos if needed. Double stuffed doesn’t work as well as the “single stuffed” cookies. Low FODMAP Notes: Low FODMAP ingredient information is based on the Monash University Food App and FODMAP Friendly App testing results.