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Destroy it, then pick it up.
Unfortunately you can't pick up cake when it has been placed.
Mine it using a pickaxe (wood or better), then pick up the drop.
You can pick up a hat in Roblox by simply touching it. Be aware that you can only pick up and wear one hat after you have dropped your hat(s). You cannot pick up three hats at once in game even though you can wear three at once.
If you are looking for a way to pick them up, well, you can't pick mob spawners up. You can only destroy them with a pick but it can give you a lot of exp.