Preheat the oven to 400°F (200°C).
Line a baking sheet with parchment paper.
Arrange the English muffin halves cut-side up on the baking sheet.
Lightly toast them in the oven for 4 to 5 minutes.
Meanwhile, melt the butter in a nonstick skillet over medium heat.
Whisk the eggs with the salt, pepper, garlic powder, and onion powder.
Cook the eggs, stirring gently until they are softly scrambled. Remove from the heat while they are still slightly creamy.
Divide the scrambled eggs evenly among the toasted English muffin halves.
Sprinkle with the cheddar and mozzarella cheeses.
Top with the crumbled bacon.
Bake for 6 to 8 minutes, or until the cheese is melted and bubbly.
Garnish with chopped chives and serve immediately.