Rinse shrimp and pat dry with a paper towel. Drizzle olive oil into medium skillet and add butter over medium-low heat. Once butter has melted, add in shrimp and garlic. Cook, stirring often, until the shrimp have turned pink, about 3-5 minutes. Add in buffalo sauce and cook another 1-2 minutes until thickened. Remove skillet from heat and set aside.
Place salad greens on each plate, topped with onion, cucumber, and tomatoes. Spoon on shrimp, being sure to spoon on additional sauce onto the salad. Top with blue cheese and serve.