Step 4
In a large sauté pan or skillet, melt the butter over medium heat. Add the flour and stir constantly for about three minutes, until completely smooth and incorporated. Pour in 1 cup of the milk in a thin stream while whisking. It will start out lumpy, but keep whisking and it will smooth out into a thick paste. Add the rest of the milk and whisk until smooth. Keep on medium heat, stirring occasionally, for about 10 minutes, until the sauce thickens. Remove from the heat and add the pepper, 2 cups of cheese, and half of the spam cubes. Stir until cheese is melted. Add the drained pasta and gently mix. Taste and adjust seasonings if needed.