Preheat oven to 400 degrees. Spray cups with canola oil. Line each cup with three or four sweet potato tots and set aside. Add butter to a medium pan on medium heat, and sauté leeks 2-3 minutes until caramelized. Remove from pan and set aside in a medium bowl. Cook bacon in the same pan. Once crispy, remove to cool, blot dry, then chop into small pieces. Add bacon pieces to bowl of leeks, then stir in eggs, salt and pepper. Set bowl aside. Add three to four pinches of goat cheese on top of the sweet potatoes in each cup. Then, evenly distribute the egg mixture among the cups. Bake for approximately 20-23 minutes until egg is cooked and tops have browned slightly. Allow to cool for a minute, then run a knife around the edges of each cup, carefully remove and place in a serving platter. Serve immediately.