Currently, you have 1 meal planned at MGM (Prime Time), 1 meal planned at EPCOT (Le Cellier), and 1 meal planned at a resort (Chef Mickey's) which is also in the MK area.
So, if I were you, I would plan either a meal at MK - either LTT or CP - because you don't have a meal at MK currently, or, if you plan to tour AK, maybe schedule Boma at the AKL.
If you schedule LTT or CP, you've then got a meal at 3 parks & 1 meal at a resort. If you schedule Boma, you've got a meal for each "area" of WDW: Chef Mickey's for the MK area, Le Cellier for the EPCOT area, Prime Time for the MGM area, and Boma for the AK area. (But, if I wasn't planning to tour AK, then I wouldn't schedule Boma.)
If I were planning 5 TS meals, I'd probably try to schedule the following:
Chef Mickey's for breakfast
LTT (dinner) or CP (breakfast or lunch) at MK
Le Cellier (dinner) at EPCOT
Prime Time Cafe or Sci-Fi at MGM
Boma (dinner) at AKL
Other good, "family-fun" suggestions for the the MK area are 'Ohana (at the Poly) & WCC (at the WL), but, since you've already got one meal scheduled at a MK resort (Chef Mickey's), I'd probably go w/ LTT or CP.
The food at LTT is served family-style - turkey, ham, roast beef, green beans, mac & cheese, dressing, declaration salad (tossed salad w/ strawberry vinegarette dressing), rolls w/ honey butter, & apple cobbler & ice cream. The characters are Goofy, Minnie, Pluto, Chip, & Dale.
Since, you already have a meal (Chef Mickey's) w/ these characters, you could schedule a meal at Crystal Palace in the MK. The buffet has so many yummy selections! The characters are Pooh & Friends.
We like dinner at LTT & breakfast or lunch at CP.
Boma is a wonderful buffet at the AKL which is a gorgeous resort. The buffet has lots of "exotic" selections, but it also has plenty of selections for pickier eaters as well. It's a fun place to eat! Try the Zebra Domes!!

And walking around the resort is a great experience too. The CM's at Boma are so nice!
Hope this helps! Let us know what you decide!