Prep the ingredients per the instructions above.
Preheat oven to 350°F (180°C). Lightly spray a muffin tin with nonstick spray. (1 for each different kind of frittata).
Crack one egg into each muffin well, portion the minced onion into each well, and season wiith salt and pepper. Whisk each well until the egg is beaten.
Place the bacon in a saute pan over medium heat. Saute until golden brown and somewhat crispy. Remove to paper towels to drain any excess grease.
Portion the three different toppings into the individual muffin wells and mix.
Bake for 15-20 minutes, until set. (Test by poking a toothpick into the center, should come out clean).
While the frittatas are baking, make the juice. Cut the oranges in half. Using a manual juicer or electric juicer, juice the oranges into a pitcher or glass. Refrigerate until ready to serve. (About 5 to 6 oranges yield an 8oz glass of OJ.)
Once the frittatas are set, let them cool slightly. Toast the bread then spread it with butter.
Serve the frittatas with toast and juice.