Combine mustard powder and cajun seasoning, mix well.
Assemble shrimp and scallops on bamboo skewers. Season liberally with avocado oil and Cajun Mustard seasoning. Wrap in plastic wrap, allow to marinate 1 to 48 hours.
In a mason jar, combine cream, parmesan cheese, cream cheese and cajun mustard seasoning, cover with a lid & shake well to combine. Can be assembled up to 3 days in advance.
Over your campfire (or grill) cook shrimp and scallops until cooked through. Remove from heat and place on a plate covered with foil.
Place broccoli on the grill, drizzle with olive oil.
In a skillet over the fire/grill, pour mason jar of sauce and whisk to combine. Sauce is done when melted and smooth.
Serve shrimp and scallops with sauce and broccoli on the side.