Heat a skillet with olive oil over medium-high heat. Add the minced garlic and cook for about 1 minute until it smells wonderfully fragrant.
Toss in the breakfast sausage and cook for about 10 minutes, breaking it up with a spatula until it's nicely browned.
While the sausage cooks, preheat your oven to 375°F (190°C).
If you're using broccoli, quickly blanch it in boiling water for 5-7 minutes until it's crisp-tender. Then, dunk it in an ice bath to stop cooking, drain well, and pat dry.
In a big mixing bowl, whisk together the eggs, heavy cream, half of the shredded cheddar cheese, fresh parsley, sea salt, and black pepper until well combined.
Lightly grease a 9x13 inch casserole dish. Spread the cooked sausage (and any pre-cooked veggies like broccoli) evenly across the bottom.
Pour the creamy egg mixture over the sausage and veggies. Finish by sprinkling the remaining cheddar cheese generously on top.
Bake for about 30 minutes, or until the eggs are completely set and the cheese is beautifully melted and bubbly.