In a large skillet, melt butter over medium-high heat then with tongs, grab individual shrimp and shake off excess cornstarch. Add to skillet and sear on both sides then remove and place on a plate so you don't overcook the shrimp. It's okay if it's not fully cooked through. You will ensure it's completely cooked through shortly.
4 tablespoons unsalted butter
Add garlic to skillet and saute until fragrant, about 30 seconds. Add shrimp back in and cook until cooked through.
4 cloves garlic
Fluff cooked quinoa and season with salt and pepper. Add basil, toss to incorporate, then divide evenly amongst bowls.