Pulse pecans in a blender (or food processor) until crushed into fine crumbs.
In a shallow, wide bowl, combine pecan crumbs, flour, salt and pepper. Mix well.
Preheat a cooking pan over medium heat and add oil.
Coat chicken tenders generously in the pecan crumbs, patting them down while coating so the crumbs stick on nicely.
Cook chicken tenders until fully done, about 5-7 minutes on each side.
While the tenders are cooking, you can make the sauce:
In a small sauce pot, over medium heat, whisk together oil and flour. Once it starts to heat up, slowly pour in milk, while whisking. When milk starts to simmer, add freshly grated cheese and stir until all the cheese is melted and sauce is smooth.
Once chicken and sauce are done, serve with your favorite side and top tenders of with some sauce!