Magic initiate feat question

[Spacehamster]

So simple question: can you cast the level 1 spell learned from the feat with your other spell slots or only with the one per long rest "slot" the feat gives you?

[Aironfaar]

That's a question I asked myself too, and I found the answer in a compliation of Sage Advice stuff. I can't post the link to it yet as I'm below 10 posts, but I'll copy the whole Magic Initiate-related stuff for you:

Magic Initiate

If you’re a spellcaster, can you pick your own class when you gain the Magic Initiate feat?
Yes, the feat doesn’t say you can’t. For example, if you’re a wizard and gain the Magic Initiate feat, you can choose wizard and thereby learn two more wizard cantrips and another 1st-level wizard spell.

If you have spell slots, can you use them to cast the 1st-level spell you learn with the Magic Initiate feat?
Yes, but only if the class you pick for the feat is one of your classes. For example, if you pick sorcerer and you are a sorcerer, the Spellcasting feature for that class tells you that you can use your spell slots to cast the sorcerer spells you know, so you can use your spell slots to cast the 1st-level sorcerer spell you learn from Magic Initiate. Similarly, if you are a wizard and pick that class for the feat, you learn a 1st-level wizard spell, which you could add to your spellbook and subsequently prepare. In short, you must follow your character’s normal spellcasting rules, which determine whether you can expend spell slots on the 1st-level spell you learn from Magic Initiate.