Start by placing the eggs in a pot and covering them with cold water by about an inch. Bring the water to a rolling boil over high heat, then cover the pot, reduce the heat to low, and let them simmer for 9-12 minutes. Once cooked, transfer the eggs to an ice bath for about 5 minutes to cool and make peeling easier.

In a medium saucepan, melt 4 tablespoons of unsalted butter over medium heat. Allow the butter to froth and bubble for about 2-3 minutes, then add the sliced onions. Sauté the onions until they turn soft and translucent, about 3-4 minutes, stirring frequently to avoid burning.

Once the onions are soft, toss in 4 cloves of minced garlic and 1 tablespoon of garlic paste. Stir the mixture, allowing the garlic to become fragrant, which should take around 1-2 minutes. Next, sprinkle in the Old Bay seasoning, cayenne pepper, paprika, garlic powder, onion powder, and red pepper flakes, mixing well to coat the onions and garlic with these bold flavors.

Pour in 1 cup of vegetable broth to the sautéed mixture, stirring gently to combine. Raise the heat to medium-high and bring the sauce to a simmer. Allow it to bubble gently for about 5 minutes, letting the flavors meld together and the broth reduce slightly while keeping an eye on the consistency.

Carefully peel the boiled eggs and place them in a serving bowl. Drizzle the hot spicy garlic butter sauce generously over the eggs, ensuring they are well-coated. You can also sprinkle additional seasonings if desired for a pop of flavor, such as more red pepper flakes for extra heat.

These Cajun boiled eggs with spicy garlic butter sauce can be served warm or chilled, depending on your preference. They make for a savory, satisfying snack, so feel free to enjoy them straight from the bowl or plated elegantly alongside a fresh salad or crusty bread to soak up that irresistible sauce!