What can I do if I forgot to cream the butter and sugar in my cookie recipe?
meh; I have used the “reverse” mixing method for sugar cookies; which is essentially what you did; just need to add more butter and/or cream cheese to pull together now.

The only thing you can't recover from is if you over-mix the flour; if your cookies are glue'y then you over-mixed and you need to throw away.

I find that the details are much more important in sugar cookies; type of flour, type of sugar, butter, ratio; etc...

Letting the dough sit over night will allow autolyseae to happen; as a added bonus.

My recipe:
2 1/2 cups flour; sifted
3/4 cup supppppeeeerrr, superfine sugar (usaully blended in ninja)
1/4 teaspoon salt
16 tablespoons (2 sticks) unsalted butter, cut into 1/2″ pieces &amp; softened
2 tablespoons cream cheese, softened
2 teaspoons vanilla extract

Blend dry ingredients; add butter cubes until desired consistencey; cream cheese to pull dough together.