Add oil and butter to small saucepan on medium heat
Add shallots for 2 minutes then add garlic on low heat for another 2 minutes
Whisk in flour and cook until it bubbles. Slowly whisk in the milk. It will begin to thicken, continue whisking in the milk and cook for 3-5 minutes.
Add in the shredded cheese and cook until melted
If the sauce is too think you can add a little extra milk to thin it out.
Finish with salt and pepper
Pour onto your whole roasted broccoli