You don’t leave too much, just half-eaten scraps. A crust of bread, half a cookie, something like that. Too much and they’ll know it’s a trap.
Once you’ve got them, you’ve still got to negotiate. They can fix just about anything, but you’ve got to make it worth their while. Confections are best, followed by other baked goods. Make sure you’ve got something sugary they can drink, like Hawaiian Punch.
Live up to your end of the bargain, whatever you do. They can break your stuff just as fast as they can fix it. And then they’ll come for you.