Sounds like you're off to a great start! I think the more we do each week, the easier it will be to work up to monthly or at least less often. And each day dinner will be so quick and easy!
Hmm, those treats sound good! Muffins freeze well. Are you going to freeze the baked cookies, or just the cookie dough? I like having cookie dough because fresh baked is so good, and making the dough is what seems to be time consuming (and messy, all those bowls and mixer blades!)
How about breads? Regular and chocolate zucchini bread, banana bread, plum bread. You can bake as muffins, mini loaves, or full-size loaves.