Hi Stan and welcome to the Disney Parks Moms Panel.
The best way to get from
Disney's Port Orleans Resort - Riverside to
Chef Mickey's would be to take the bus from your Disney Resort hotel to the
Magic Kingdom Park and then from there, take a short 5-10 minute walk over to
Disney's Contemporary Resort.
As your Advance Dining Reservation is for 7:30 AM, I would recommend that you aim to be at the bus stop at your Disney Resort hotel by no later than 6:30 AM on the day of your dining reservation at Chef Mickey's. I would also encourage you to stop by the front desk at your Disney Resort hotel the day before your dining reservation to double check that the
Walt Disney World Bus Service will be operating at that time of the morning.
If you want to experience the monorail, I would suggest taking the
Resort Monorail from Disney's Contemporary Resort to the Magic Kingdom Park once you have enjoyed your breakfast with Mickey Mouse & pals.
Wishing you a magical trip filled with memories which will last a lifetime!
Emma