1️⃣ Prepare the meat mixture: In a large bowl, combine the ground beef and Italian sausage. Use your hands to gently mix until well combined. Divide the mixture into 4 equal portions and roll them into balls.

2️⃣ Preheat the grill or skillet: Heat a grill or large cast-iron skillet over medium-high heat. If using a skillet, add olive oil to prevent sticking.

3️⃣ Smash the patties: Once hot, place the meatballs onto the cooking surface. Using a flat spatula or burger press, smash each ball down to form a thin patty (about 1/2 inch thick). Season with salt and pepper.

4️⃣ Cook the patties: Let the patties cook for about 3-4 minutes on the first side, then carefully flip. Immediately sprinkle a generous handful of shredded cheddar cheese on each patty. Cook for another 2-3 minutes until the cheese is melted and the patties are nicely browned.

5️⃣ Toast the buns: While the patties finish cooking, slice the brioche buns in half and lightly toast them on the grill or skillet until golden brown.

6️⃣ Assemble the burgers: Spread mayonnaise and Dijon mustard on the bottom half of each bun. Place a cheesy sausage smash patty on top, followed by shredded lettuce, tomato slices, red onion, and pickles (if using). Cap it off with the top half of the bun.

7️⃣ Serve: Enjoy your Sausage Smash Burgers immediately while hot, served with fries, chips, or a fresh side salad!