Scrub and rinse the potatoes well. Cut them into cubes and add them to a large stockpot together with the garlic cloves. Cover with cold water and bring to a gentle boil. Add the bay leaf and sea salt and cook until tender, about 15 minutes.
While the potatoes are cooking make sure to preheat the broiler.
Chop up the andouille sausage into small cubes.
Heat up a cast iron skillet on medium flame and sear the andouille cubes until golden brown. Set aside.
Drain the potatoes in a colander and discard the bay leaf. Transfer them to a large mixing bowl and add the butter. Toss to combine until the butter is melted from the steam of the potatoes. Mix in the warm heavy cream.
Mash the potatoes with a masher until soft and fluffy. Add in the sour cream and mash some more until all is incorporated. Season with the freshly cracked black pepper.
Add the andouille sausage cubes to the mashed potatoes and stir to combine. ( Save a few pieces to sprinkle over the top)
Transfer the potatoes to a broiler proof dish and using the back of a spoon form some nice peeks all over. Sprinkle with the panko bread crumbs and the parmigiano-reggianno and drizzle with a light drizzle of olive oil.
Transfer the dish under the broiler for a few minutes until golden brown on top, taking good care not to burn them.
Serve hot, garnished with the chives, parsley, reserved andouille and any edible flowers you might have on hand.