There aren't many cookies.
There are a lot of cookies.
There's a lot of cake.
There isn't much cake.
There are a lot of grapes.
There aren't many grapes./There are a few grapes.
There isn't much fruit.
There's a lot of fruit.
There's a lot of chicken.
There isn't much chicken.
There are a lot of burgers.
There aren't many burgers.
There isn't much spaghetti.
There's a lot of spaghetti.