Chop or julienne 6 sweet onions.
In a large saute pan, place 1/2 lb unsalted butter and a small amount of extra virgin olive oil.
On a stove, melt butter with olive oil. Add 1 tablespoon season salt.
Add 2 cups sugar.
Add cut onions into pan. Allow them to sit in the heat, steaming the onions.
Lay out a strip of cling wrap. Place puff pastry sheets on cling wrap, then cover with more cling wrap. Allow puff pastry sheets to thaw. Afterwards, cut puff pastry into circles large enough to cover a section of muffin tin. Spray muffin tin with cooking spray, then wipe down with paper towels. Place pieces in tins.
Cube or shred 1 wheel brie cheese.
Cube or shred 12 oz. package muenster cheese.
Place cubed or shredded brie and muenster cheeses on top of puff pastries in muffin tin.
Placing cheeses in muffin tins
Once onions have steamed, drain butter. Be sure not to leave any liquid, as it can make tortes soggy.
Place onions on top of puff pastries. Place in preheated, 425 degree oven. Bake for 30 minutes.
Using a spoon, place a dollop of seedless red raspberry preserves on each torte.
Serve and enjoy!