Note: Just so you know, I do my sauce backwards and over direct heat. It's simple and effective.
Butter. Melt the unsalted butter in a sauce-pan over low heat, stirring constantly so it does not burn. Remove the butter from the heat.
1 stick unsalted butter (8 Tablespoons)
Whip. Using a hand whisk in a bowl or immersion blender in a deep container, whip the yolks and lemon juice until about double in size and thick.
Whisk and Water. Place the butter back on low heat. While whisking, gradually pour the egg mix into the butter. This will look like oil and water not mixing... keep whisking until all the egg mix is in the butter. Continue to whisk over low heat. The sauce will start to combine but look 'broken', add 1 Tablespoon of water and continue whisking until the sauce pulls together and thickens. It will be a beautiful, creamy yellow. In total, about 1-2 minutes.
1 Tablespoon water
Season. Add to the sauce salt, onion powder, garlic powder, and paprika. Cook for 1 minute. Remove from heat.
1/4 teaspoon garlic powder, 1/4 teaspoon onion powder, 1/8 teaspoon paprika
Caution: keep the heat low, if you start to get little 'chunks' of egg, you'll know the heat is too high. Just lower the heat, whisk them out and keep going.