Prepare the Ingredients: Slice the white onion, julienne the carrot, and slice the mixed bell peppers and celery. Mince the garlic.
Rinse the shrimp under cold water and pat dry with paper towels.
Marinate the Shrimp: In a bowl, combine the shrimp with 2 tablespoons of soy sauce and minced garlic. Allow the shrimp to marinate for 10-15 minutes.
Mix the Cornstarch Slurry: In a small bowl, whisk together the cornstarch, The rest of the soy sauce and water to create a slurry. Set aside.
Cook the Vegetables: Heat a large skillet or wok over medium-high heat. Add a teaspoon of oil.
Stir-fry the sliced onion until translucent, then add the carrot, bell peppers, and celery. Cook for 3-4 minutes until the vegetables are slightly tender but still crisp.
Add the bean sprouts and baby corn to the skillet, and continue to cook for an additional 2 minutes.
Cook the Shrimp: Push the vegetables to one side of the skillet, and add the marinated shrimp to the empty side.
Cook the shrimp for 1 minute on each side until they turn pink and opaque.
Combine Everything: Once the shrimp are cooked, stir everything together in the skillet to combine. Give the cornstarch slurry a quick stir, then pour it into the skillet. Stir well to coat the ingredients evenly with the sauce.
Simmer and Serve: Allow the mixture to simmer for 2-3 minutes, stirring occasionally, until the sauce has thickened to your desired consistency. Taste and adjust seasoning, adding more soy sauce if needed.