I used this recipeto bake cookies on three separate occasions. On the first occasion they turned out beautifully, chewy and firm without being hard, but the last two they turned out flat. The balls of dough would kind of ooze out in the oven and come out rather uninspiring.
I’m not quite sure what has gone wrong. I know that I pretty much melted the butter the first time around because at the time I didn’t have a mixer and trying to cream butter and sugar with a fork is difficult. (Can’t remember what I did the second time.) The third time around, I tried putting in more baking soda, but since then the Internet has informed me that probably worsened the problem. But I put in the normal amount the second time and they were still flat.
Is it possible my baking soda has gone bad?