*This step is OPTIONAL. If you'd rather not take time to cut hearts that are going to bake into the casserole, don't do it! Just use torn-up tortillas - maybe about 5-6 - and layer them instead of the heart shapes. If you're making these with kids, cutting out the hearts will be a fun step! But if not, skip it and just cut out hearts LATER for the top of the casserole. [br][br]Another note: If you do cut larger heart shapes out to bake inside the casserole, keep the remaining tortillas (the ones you didn't cut) in the package until you use them. Corn tortillas tend to buckle fairly easily. When you cut the tortillas, DO NOT bend them in half to cut a heart shape. You know how you fold a piece of paper in half and then easily make one cut to get a heart shape? You can't do that with corn tortillas - they'll break in half. You can easily cut these with kitchen shears, or you can use a metal heart-shaped cookie cutter and cut them that way. [br]**Wait until you're almost ready to serve the enchilada casserole to cut out the small heart shapes out of the tortillas to decorate the top. You'll want to preserve their shape, so wait until closer to serving time to spread them across the top of the casserole.