Preheat oven to 350 degrees F.
Remove the pie crust out of the fridge and let it get to room temperature while you prepare the filling.
In a small saucepan over medium heat, melt the butter and add the onions. Cook until the onions are a light caramel color, then remove from the heat.
Crack the eggs into a medium-sized mixing bowl and whisk, then add the milk, ham, shredded cheddar cheese, minced red pepper, garlic powder, salt, pepper, crushed red pepper, and cooked onions. Whisk with a fork until all of the ingredients are well-combined.
Roll the pie crust out and lay it on top of a 9" pie plate so that it hangs over by about 1/2". Press the pie dough into the edges of the pan. Using your fingers, pinch the edges to make a decorative edge.
Add the cubed bread evenly over the bottom of the pie dough, then pour the egg mixture on top. Sprinkle the remaining cheese on top of the egg mixture.
Bake in your preheated oven for 60 minutes, or until the edges of the egg mixture are golden brown. In the meantime, make the hollandaise sauce.
In a blender, blend the 3 egg yolks for 2 minutes. Turn the blender on low and slowly drizzle the melted butter into the egg yolk mixture (should take about 30-60 seconds), then slowly add the lemon juice and 1 tablespoon of hot water followed by the salt, pepper, and cayenne.
Turn off the blender and taste, adding a bit more seasoning and up to 2 more tablespoons of hot water to make a thinner consistency.
Serve quiche warm with the blender hollandaise. Enjoy!