In a large mixing bowl, measure out the puffed quinoa and set aside. Lightly butter a 9×13 inch baking dish and set aside as well.
In a large pan, melt the butter and oil over low/medium heat. You can use all butter here if you like. I was just experimenting subbing out some with coconut oil, and it was really good. So I’m sharing.
Once melted, add the marshmallows and stir with a heatproof rubber spatula as they melt. As soon as they are melted, pour over the quinoa and stir so all the pieces get coated with the marshmallow. Transfer to the baking dish and use the rubber spatula to press into place. Toss the sprinkles over the top and lightly press into the treats.
Allow to cool before cutting.