Cook pasta, al dente, according to package directions. Drain and set aside.
In a small bowl, whisk together flour and ½ cup milk until completely smooth.
Turn on the burner to medium-low and melt butter in a medium nonstick skillet.
Add flour mixture to skillet, stir, then add the remaining milk (1.5 cups).
Turn skillet up to medium and heat for 7-10 minutes until sauce mixture is thickened. Whisk constantly! If flour begins to stick to bottom remove from heat and turn it down before returning to heat. You will know your sauce is done when you feel some resistance on your whisk. Instead of being a thin watery substance, it should resemble a cream.
Turn the heat off, stir in the cheese, and seasonings. Whisk until all the cheese is melted and a smooth creamy sauce is achieved. Add in greek yogurt, if desired.
Pour sauce on top of cooked pasta and mix until well combined.
Video
Notes
We love the Banza brand, but I've also tried Thrive Market and Rotini, both are delicious!