I have tried various sausage casserole recipes in a bid to combat this, but can't seem to solve the problem.
I always brown the sausages first, draining away any water/fat, but when the casserole comes out of teh oven it has a thick, greasy layer on it rendering it uneatable. I know this isn't normal as it never used to happen but can't work out what I was doing differently back then.
I have tried various types of sausage, both fresh and frozen.
Maybe it's a sign I shouldn't be feeding my family sausages ;)