We love enchiladas and I have many recipes for them, but I have a problem. I cook them in the oven, covered for about 45 minutes, then take the cover off, and cook until the flour tortilla shells puff up, and the cheese is bubbly. The bottoms are always soggy and slimy. I make my enchiladas in the morning, cover and put into the refer. I then bring them to room temp. before putting into the oven. Any suggestions for getting a less soggy bottom?