Preheat and prep: Heat your oven to 375°F (190°C).
Line a 9x13-inch baking dish with parchment or lightly grease it with butter.
Cook the bacon: Lay bacon on a sheet pan and bake for 15–20 minutes until crisp. Drain on paper towels. You can also pan-fry if you prefer.
Make the keto bun layer: In a bowl, mix almond flour, baking powder, and salt.
Stir in shredded mozzarella. Beat in 2 eggs until a thick, sticky dough forms.
Bake the base: Spread the dough evenly into the prepared baking dish. Press with greased fingers to reach the edges.
Bake for 8–10 minutes until set and lightly golden at the edges.
Whisk the eggs: In another bowl, whisk 8 eggs with heavy cream, garlic powder, onion powder, salt, pepper, and red pepper flakes if using.
Pour and layer: Remove the base from the oven. Pour the egg mixture evenly over it. Sprinkle the shredded cheddar over the top.
Add the bacon: Roughly chop the cooked bacon or keep in halves.
Distribute evenly across the eggs and cheese.
Bake the sliders: Return the dish to the oven and bake for 15–20 minutes, until the eggs are set in the center and the cheese is melted and bubbly.
Finish with butter and herbs: Brush the top lightly with melted butter. Sprinkle chives or green onions on top for freshness.
Cool and slice: Let it rest for 5 minutes to set. Slice into 12 small sliders or 8 larger ones.
Serve warm.