In a big bowl, combine the paprika, garlic powder, cumin, salt, and pepper in a large bowl.
Pat dry the shrimp, then toss in the seasonings until they are coated. Allow them to sit for 15-30 minutes to soak in the flavors.
While the shrimp is resting, make the dressing by combining the vinegar, olive oil, and mustard in a jar or small bowl. Whisk everything until combined. Set it aside.
Assemble the vegetables in a bowl, including the lettuce, peppers, cucumbers, tomatoes, onions, and fresh herbs.
Once the shrimp is ready, heat the butter in a large skillet on the stovetop on medium-high heat until it sizzles.
Place the shrimp in the skillet, making sure not to overcrowd them. Cook for 2-3 minutes on each side until a nice browning or crispness occurs.
Serve the shrimp over the salad mix, drizzle with the dressing (shake before pouring). Enjoy.