The phrase "magic bullet" means a quick and effective solution to a problem or a cure for a certain disease. It refers to something that can swiftly and easily solve a difficult situation or achieve a desired outcome. Full definition
Regardless of how they're classified, sugar substitutes aren't magic bullets for weight loss. (mayoclinic.org)
Blend garlic, onion, cumin, chili, salt, vinegar, and oregano in Magic Bullet with a bit of oil to make a paste. (magicbulletblog.com)
I am a (moderate) supporter of opening up selections - though I don't think this is necessarily any sort of magic bullet in changing the culture of the party. (nextleft.org)