Chocolate chip cookies spread too much - how to fix?

I’ve been making a standard thick chocolate chip cookie - recipe from Back in the Day Bakery - for years. I love it. I follow it closely. But the last few times the cookies spread out and I can’t figure out why. Over creaming butter/sugars? Skimping on flour? The recipe calls for no dough chilling which has worked for me in the past and even if I chill they still spread. I bake on parchment in a consistent temp oven; use room temp Costco butter. Looking for tips!

I’ve been making a standard thick chocolate chip cookie - recipe from Back in the Day Bakery - for years. I love it. I follow it closely. But the last few times the cookies spread out and I can’t figure out why. Over creaming butter/sugars? Skimping on flour? The recipe calls for no dough chilling which has worked for me in the past and even if I chill they still spread. I bake on parchment in a consistent temp oven; use room temp Costco butter. Looking for tips!