Lastly, add in 8 oz of freshly shredded sharp cheddar cheese. Stir until fully melted. Then serve warm. TIP: don’t use the pre-shredded cheeses. The added cornstarch will make your sauce too thick and gritty.
Notes
Shred your own cheese- Shredded cheese is tossed in starch to keep it from sticking, which also keeps it from melting together. Shred your own cheese to avoid a grainy mess.
Whisk the roux continuously- Your roux will be very dry and thick so continuously whisk it to avoid it burning and turning into clumps.
Add the milk slowly- Give the roux a chance to bind with the milk by adding it slowly and stirring it in, working out any clumps now for a smoother cheese dip later.
Don't stop stirring until the sauce is smooth- Stir, stir, stir. Make sure the pretzel dip is free of clumps and the cheese has fully melted before putting your whisk down.