The phrase "bigger pie" means having more resources, opportunities, or benefits available to share or enjoy. It suggests that when there is a bigger pie, there is enough for everyone and nobody misses out. Full definition
Frankly when I talk to an entrepreneur who seems obsessed with protecting their slice, I wonder whether they have the ambition to build as big a pie as I do? (kpcb.com)
-LSB-...] this recipe in one big pie pan if you don't have tart pans. (ohladycakes.com)
Fill the bottom either of several small containers or one big pie dish with a layer of this nutty goodness. (deliciouslyella.com)