1. In a medium skillet over medium heat, melt butter, then add onion and saute until caramelized (about 15 minutes). Add garlic and cook for 30 seconds. Transfer to mixing bowl.

2. Replace pan over heat and add beef bacon. Fry until crispy, about 10–12 minutes. Drain on paper towels.

3. Preheat oven to 375°F.

4. Crack eggs into bowl with onion and garlic, pour in heavy cream, and whisk until combined.

5. Crumble beef bacon into the bowl, add cheeses, and mix. Pour into a 9-inch pie dish and bake for 20 minutes until set but slightly wobbly in center.

6. Cool for 15 minutes before slicing and serving.