Preheat oven to 350° F (180° C). Chop broccoli into florets.
Bring 6 cups of water to a boil in a large saucepan and add broccoli florets. Boil on medium-high for 8 to 10 minutes.
Drain broccoli in a colander. Stack a few paper towels together and dump broccoli onto paper towels.
Wrap broccoli in paper towels and press down in the colander to squeeze out any excess water.
Add to a food processor: the broccoli florets, garlic cloves, sea salt, black pepper, melted butter and ¼ cup of the grated Cheese.
Process until a smooth green paste forms.
Add the broccoli paste to one 24-ounce shallow baking Au Gratin dish (or divide into two 12-ounce baking dishes).
Spread evenly in the dish and drag a fork along the top of the broccoli mash to form grooves.
Drizzle the heavy cream over the top and sprinkle with the remaining ¼ cup grated cheese.
Bake at 350° F (180° C) for 15 minutes.
Once cook time is done broil on low for 2 minutes to brown the cheese lightly.
Remove from oven and sprinkle the cooked crumbled bacon over the top. Serve warm.
