I've cooked a few things, but it seems every "simple," healthy recipe requires a bunch of spices or 2tbsp. of this 1tsp. of that so after I buy everything for it I've spent $100 at the grocery on only a few meals!
While the initial "build out" of spices can seem expensive, once you have them built up, you will find you only buy one every now and then. And soon you'll be to the stage where you find a new recipe and go "Oh - I have just about everything I need for that here around the house already!" So things won't be so expensive.
I suggest you start with simple things like stir-frys, tacos, soups, etc. Keep things like sandwich makings on hand so that when you are too tired to cook you at least have something to fall back on instead of going out or getting fast food. Stock up on stuff you know you'll use in the next month or two, but don't go crazy stocking up if it's just you - many things can go bad before you use them, so that's just a waste of money. Watch meat sales - I look at just the front page of the sales flyers each week - and get to know what a "good" price is and buy basic cuts that can be used for a lot of things (boneless chicken breast, ground beef, etc.) when those good prices come up. Compare the grocery stores in your area to see if one is cheaper than the others - try some in areas you might not normally try. I found a market 7 miles away from me that many people would write off because its not as "pretty" as the local markets but prices are generally 20-30% less than more the markets in my neighborhood. I don't need to watch for sales for stuff other than meat because this market's regular prices are better than the other stores sale prices!
Also, try a new recipe at least once a week - while many will be bombs

(I feed DD12 and myself on less than $200 a month - and that includes me taking lunch to work just about everyday.)