I think the easiest/fastest would be to take the monorail to MK and then bus to BC. Still, I'd allow about an hour to get there.
Can I ask you something though.. there are so many great breakfasts, at the GF or only a monorail ride away (1900 Park Fare, Chef Mickey's, 'Ohana, Kona, Crystal Palace, CRT... ), so why pick one that's so much harder to get to ?