Yes, you can always use instant. But food editor Margo True swears by steel-cut: "I love it because it has a chewier texture than instant or ordinary rolled oats and a deep, nutty flavor." It also freezes well (add the fruit after defrosting), so make a big batch on the weekend.
These are really good. Bake the crescent rolls and spread each one with cream cheese and mayonnaise. Sprinkle with dill and garlic, and arrange assorted veggies on top. Chill and cut into squares for appetizers.