Cook one 12-ounce bag shaved Brussels sprouts, 4 ounces sliced mushrooms and a pinch of salt in a skillet with vegetable oil until crisp-tender, 5 to 6 minutes, stirring halfway through. Push the vegetables to one side. Add 1 teaspoon oil and 1 minced garlic clove; cook 20 seconds. Add 3 tablespoons Asian sweet chili sauce and 1 tablespoon fish sauce; toss. Top with chopped cilantro and mint.