OVEN: Preheat oven to 300 °F (148° C). Grease very well a standard 12-cup muffin tin with cooking spray and reserve. Meanwhile, blend whole eggs or only whites with cheese, cream cheese, and seasonings in the blender until frothy.
Pour mixture into the greased muffin tin and place your add-ins such as cooked bacon bites and spinach, or roasted red pepper and basil.
Place muffin tin into a large roasting pan with boiling water coming halfway up. Bake the whole egg mixture for about 30 minutes but the egg white mixture for about 20-25 minutes. They are ready when egg bites are just set and have a custard-like texture.
Let pan cool on a rack for 3 minutes, run a knife around the edges to loosen them, and gently remove bites. You may use a spoon or invert them over a platter. Don’t wait much longer than 3 minutes or they may become difficult to remove. Serve while hot.
PRESSURE COOKER/INSTANT POT SOUS VIDE: Set up your Instant Pot or pressure cooker by pouring 1 cup of water inside the bowl and then place the rack/trivet. Next, put the silicone mold filled with the egg bites batter on top. Make sure to cover the mold with aluminum foil, lock the lid, and turn the valve.
Press the STEAM or SOUS VIDE function for 10 minutes. It may take about 5 minutes or so for the pressure to build up and the function to start working. After the 10 minutes are up, let the pressure release naturally for 10 minutes before removing the egg bites.
If you are using this method to cook our egg bites, it will take about 30 minutes from start to finish for this recipe (5 minutes prep, 5 minutes to build pressure, 10 minutes to cook, and 10 minutes to release natural pressure).