It cuts into beading time. You really don't want them brown yet. Remove shells and prepare filling. You can also add cooked bacon, ham, sausage or whatever you want at this point. Steamed broccoli and some ham also makes a nice filling.
Fillings make a great way to use up leftovers.
Honest, I really don't cook. Mix cheese with the filling and add to the shell taking care not to break the now somewhat brittle shell. Now the messy part. Pour the custardy mix into the shell slowly while moving the cheese and filling around gently so that the crevices are filled. A fork is handier than a spoon for this job.