Add the all purpose flour to it and roast for few seconds.
When the flour in pan starts to turn brown, slowly add milk and stir simultaneously to avoid lump formations.
Keep stirring till the sauce thickens, once it starts to thicken add the grated cheese, crushed black pepper, pinch of salt and more milk to it and continue stirring.
Stir the whole mixture so that there are no lumps add more milk if needed, you can also add more butter.
leave the sauce to boil and thicken on medium flame.
When sauce starts boiling add Oregano and give it a mix, sauce is ready (check the sauce by tasting, if something more is to be added).
Keep the sauce aside.
For pasta
In a pan heat oil / butter.
Add veggies of your choice and saute for few seconds.
Add some salt for the veggies and the prepared sauce.
Add the boiled pasta and mix.
Pasta in white sauce is ready, serve by grating more cheese on top.
* The above picture is clicked by me.
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