Exactly how do I make mulch (INSIDE THE HOUSE)?

Exactly how do I make mulch (INSIDE THE HOUSE)?

I am an elderly cook who throws away a surprising amount of organic matter: coffee grounds, egg shells, potato peelings, banana peels, and various other vegetable matter. What I don’t know is how to turn that “garbage” into a usable fertilizer for my house plants ? And how long does it take ? I have read many articles, but they all talk about EXTERIOR compost heaps. I need to know about how to do it inside.