I agree with the person who said playdough! It is a great activity that they normally love. You can give her some playdough tools similar to your cooking tools (roller, cookie cutters plastic knife etc), sit her in the kitchen with you as you cook and talk to her about what you are doing. When she is old enough to help, she will be familiar with the activity. In the meantime she'll be having fun. Also, it is easy clean up if you take the other poster's advice and use a shower curtain (or in my case a plastic placemat). Just sweep up the crumbs when she is finished.
Also, I recommend looking for small inexpensive play sets of whatever they like (My Little Pony or whatever -- I have boys, so I am not up on current girl toys ;-) and save these for special time. I would get some they really love and put them on top of the fridge reserved for this time of day only. That way they are special and they will look forward to having the time with them and you.
I am not a TV hater, but I would rather have the kids in the kitchen with me if possible. Sometimes, though, we all need to buy a little peace and quiet!
Oh, and one more thing. You could try some of the little electronic toys like Leap Pad or the Leap Frog magnets. Put one set on the fridge and one on the dishwasher and let them only use those at this time as well.
Good luck!