Brown the sausage in a large skillet over medium heat until cooked through.

Sprinkle the flour over the sausage and stir until the flour starts to be absorbed into the sausage (it won't look white anymore).

Add the milk about 1 cup at a time, stirring almost constantly with a whisk. (If you like runnier gravy, simply add more milk).

Once the gravy is the texture that you want it, add the salt, pepper, and thyme.

Serve over biscuits or toast!