Cook quinoa according to package directions and set aside (to save on time, prep the other veggies while the quinoa cooks).
Preheat a wide saute pan over medium-high heat. Add butter and let melt.
Add onions and saute until soft and translucent; about five minutes.
Stir in garlic and saute until fragrant; one minute.
Add mushrooms and cook for three minutes, stirring occasionally.
Sprinkle mushrooms with one teaspoon of salt and continue to cook for another two minutes, until the mushrooms have softened.
Add swiss chard and continue to cook for another five minutes, stirring to combine all the ingredients.
Add quinoa and remaining salt. Stir until well combined.
Remove from heat and add grated cheese. Taste and adjust seasoning if necessary.