Melt butter over medium-high heat in a large saucepan. Add in the garlic and onion and cook until just fragrant, about five minutes.
Add in the remaining ingredients, bring to a boil. Reduce heat, cover, and simmer for 12-15 minutes, or until the liquid is absorbed and the quinoa is tender. Remove from heat and let sit for five minutes, then fluff with a fork, check for seasoning, and serve.