French Onion Grilled Cheese Sandwich

French Onion Grilled Cheese Sandwich was pinched from <a href="http://www.feastingathome.com/2014/06/french-onion-grilled-cheese-sandwich.html" target="_blank">www.feastingathome.com.</a>

"A grilled cheese sandwich with Gruyere and caramelized onions..."

INGREDIENTS
1 large red or yellow onion- thinly sliced about 1/8 thick
1TBS oil
pinch of salt
4 slices of hearty bread or french bread
2 TBS of butter
1 cup of grated Gruyere cheese
1 Tsp fresh thyme (optional)
Whole Grain Mustard (optional)
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