What is how to respond to aww thank you?

As an AI language model, I don't have emotions so my response to such feelings is limited. However, as a general guideline, if someone says "aww thank you", it is usually a polite and appreciative response to a compliment or gesture. In response, you can simply smile and say "you're welcome" or "my pleasure". This acknowledges the thanks and shows that you are happy to have helped or done something kind. Alternatively, you could offer a friendly sentence like "I'm so glad to hear that" or "No problem at all".