Here is a goal: Make slime that can be eaten

Which way makes more sense to accomplish this goal?
Mix a can of frosting (Funfetti makes for pretty colors) with 2/3 cup powdered milk, 1/2 to 1 cup of cornstarch and a drizzle of olive oil. Start with a half cup of cornstarch and mix together. Add cornstarch as needed to make the consistency that you want. It takes a lot of kneading to go from crumbly to the texture of slime.