Cook bacon on stovetop. Once cooked and cooled, crumble into bite-sized pieces.
Crack eggs into medium-sized bowl. Add sour cream, heavy whipping cream, salt, and pepper and mix with a hand mixer or in a blender until well-combined.
Spray a 9×13 pan with avocado oil cooking spray. To pan, arrange single layer of cheddar cheese.
On top of cheese, pour egg mixture then top with crumbled bacon.
Bake for 35 minutes, checking after 30 minutes. Remove from oven once edges of casserole are golden brown.
Allow to cool before cutting and serving. Garnish with green onions.