Plant vegetables in Herbicided lawn

I bought a house and the previous owner left Weed&Feed containers in the basement, so I know the lawn was treated. It has been a year and I want to plant vegetables but do not want to eat herbicide.

What should I do to prepare safe-enough beds? If I need to bring in clean soil, where do you get soil you can trust?

Also, the garden needs to be on a slope, ideally, because that's where the sun is.

I am heartbroken after reading about the dangers of composting with treated grass. I already put clippings in a raised bed intended for vegetables, with oak leaves. Should I throw that out?

If I just wait 2 years, will it be relatively safe? Three years?  I don't expect perfection. Better than what I am currently eating ("organic" from Kroger) is good enough. Thank you!

hau Heather,  fear not, there is hope and you can remediate those chemicals so your foods are not contaminated.
You can purchase fungi either in spore or spawn forms these days and that is what will break down those nasty chemicals as well as getting your soil food web kick started for recovery.
You can also go wild foraging for mushrooms and use a blender and water to create mushroom slurries which you pour into the soil to do the same thing.
That grass clipping/oak leaf supplemented garden bed is another place to add mushroom slurry so the fungi can do their job of breaking down chemicals into harmless components.

Start a compost heap and add fungi to it, this will give you good compost for future amendment to  your garden beds.
See if you can find a tree service and ask if they need a place to dump the wood chips, you can usually get at least one load for free.
by mixing wood chips with other, compostable materials and adding fungi, you can not only create great compost but you can also inoculate with edible mushroom spawn that will give you great mushrooms once the spawn has fully occupied the wood chip pile (use a pure wood chip pile for oysters and Yum).

If you make as much use of the wonders of fungi, you will be chemical free in as little as one year, two years and you will have a great fungi network growing in your soil, getting rid of all contaminates and freeing up minerals for your plants so you won't need any "fertilizers".
By the way, your insects will shift to the good bug side too.

Redhawk

Here's how to confirm/deny that those herbicides will be an issue:

https://extension.oregonstate.edu/crop-production/soil/herbicide-carryover-hay-manure-compost-grass-clippings

I lost all my gardens for years way back before anyone was aware of the persistant  herbicide problem.

Any compost or similar that I consider bring in here means I have a whole lot of questions for the supplier.
Any waffling detected and they're out.

I'm very fortunate to have a compost provider in my area who is fanatical about doing it right.
he lab and then pea/bean tests everything, so it's all double tested.
If you're in my area look up Fant Farms in Morriston FL.

The other thing to think about if it's an old house is that it may have had lead paint chips scraped off the house and into the soil. I believe there are inexpensive DIY tests for this also.