Once butter is melted, add in all-purpose flour.
Whisk together well until a thick paste forms.
Stir in milk. Turn heat up to medium-high.
It will start thickening pretty quickly once you turn the heat up.
Next, stir in cubed ham…
… and frozen peas.
Lastly, stir in cooked fettuccine noodles.
Pour combined mixture into prepared baking dish.
Then serve! Perfect with a salad and some rolls!