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**Instructions:**
2. **Season the Meat**: Once the beef is browned, add the chopped onion, garlic powder, onion powder, paprika, salt, and pepper to the pot. Stir to combine, and cook for another 2-3 minutes until the onion softens.
3. **Add the Broth**: Pour in the beef broth to deglaze the pot, scraping up any browned bits stuck to the bottom. This helps ensure nothing burns during cooking.
4. **Mix in the Sauces**: Stir in the mayonnaise, ketchup, and mustard until fully combined with the beef mixture.
5. **Layer the Pasta**: Add the cooked elbow macaroni to the Instant Pot, stirring gently to combine with the beef and sauce mixture.
6. **Cheese It Up**: Sprinkle the shredded cheddar and mozzarella cheeses on top of the pasta mixture. Put the lid on the Instant Pot and set it to “Pressure Cook” for 2 minutes. Make sure the valve is set to “Sealing.”
7. **Quick Release**: After the cooking time is up, perform a quick release of the pressure by turning the valve to “Venting.”
8. **Serve**: Once the pressure is fully released, open the lid. Stir everything together, then top the casserole with shredded lettuce, pickles, and a sprinkle of sesame seeds if desired.
9. **Enjoy**: Serve this Instant Pot Big Mac Casserole hot for a quick dinner that everyone will love!
This Instant Pot Big Mac Casserole is a fun, flavorful way to enjoy the iconic Big Mac burger in a casserole format. The combination of seasoned beef, cheese, and the signature burger toppings make it a guaranteed hit for your next family dinner or gathering!
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