If your shrimp isn't already peeled, go ahead and take the shells off. Dice the bell peppers into 1-inch pieces.
Wash and dry the lettuce. Slice it into 2-inch chunks.
Preheat a skillet over high-heat with oil. Toss in the corn and sauté it until it's slightly browned. In the same skillet, sauté the bell peppers until lightly browned. Set the veggies aside.
Pop the shrimp into the skillet with oil. Once the shrimp starts turning pink, press garlic into the skillet and remove from heat.
Assemble the salad by placing the lettuce, bell peppers, corn, and shrimp in a large bowl. Toss in the ranch dressing right before you plan to serve. Enjoy!