I run flat pedal shoes on my road/gravel bike. I recommend 510 Pro shoes and pedals that are 100mm by 100mm or bigger. I find the smaller pedals don't offer enough support over long rides that you are trying to put down the power.

these are pretty light if you care about that

Xpedo Spry Platform Pedals

https://www.jensonusa.com/Xpedo-Spry...hoCYQYQAvD_BwE



these are go to for cheap good pedals

Race Face Chester Composite Flat Pedals

https://www.jensonusa.com/Race-Face-...-Flat-Pedals-2

if you want some bling one here's a review of mtb flat pedals
https://www.bikeradar.com/advice/buy...n-bike-pedals/