than, then

Than or than is used to indicate a choice, difference, relationship or alternative--
I would rather have cookies than cake.
Cookies are better than cake.
There are more cookies than I can eat.
These cookies are better than those cookies.
Do you like these cookies better than those?

Then or then means at a certain time, in a certain order, or under certain conditions--
First we went to the store, then we went to the bakery.
We'll eat our sandwiches, then our cookies.
 Let's eat lunch, then we can have cookies.

Now that you know that you can say--
" We had cookies like this last week. These cookies are better than the ones we had then."