Liquefy spread in a medium pot over medium-high intensity. Add shallot and cook, mixing, until mellowed, around 3 minutes. Add flour and cook, mixing, 1 moment.
Add milk, speeding until blend simply comes to a stew. Tenderly stew, blending continually, until combination is thickened, around 5 minutes. Mix in greens, nutmeg, salt, and pepper and cook until warmed through. Creamed greens can be made 1 day ahead, cooled totally, and put away in fridge. Warm, blending, over medium intensity.