Rinse sea scallops and pat dry with a towel. In a small bowl, mix together the cayenne, black pepper and garlic salt. Gently roll the scallops in the spices. Heat a non stick skillet over medium high heat until very hot. Pour in the oil and heat until it just begins to smoke. Carefully place each scallop in the pan with scallops flat side down. Cook for 2 minutes per side flipping them once.
In a small bowl whisk together the vinegar, mayonnaise, mustard, cayenne, salt and pepper and garlic. Slowly whisk in the olive oil in a stream. Combine the mixed greens and bell peppers in a large bowl. When the scallops are done, toss the dressing with the greens. Serve the scallops on top of the dressed greens