Start by straining the drippings using a sieve with a fine mesh.
Get rid of the leftover solids and set about 2 1/2 cups of the drippings aside for the gravy.
On medium heat in a medium saucepan, melt the butter.
Then, add in thyme and flour and mix with a whisk for about a minute, until your mixture is lightly browned.
Add in reserve pan dripping slowly and mix with a whisk.
Bring your gravy to a boil and then lower the heat and allow it to simmer. As the gravy is simmering, mix frequently with the whisk.
Continue to stir until the gravy starts to thicken, which will take anywhere from 5 to 10 minutes.
Add in your parsley, pepper, and salt to taste.