Peel and chop the potatoes. Boil in water until fully cooked through.
Drain and mash.
Add the milk and butter. Season with salt and pepper.
Heat up the olive oil in a pan over medium heat.
Add the chopped onion and garlic, and cook until translucent.
Transfer the mixture to the mashed potatoes. Add the yogurt/sour cream, flour, green onion, and cheese. Mix to combine.
Brush the liners with oil. Fill half of them with the mashed potato mixture.
Put 1 Brussel sprout in the middle, then top up with more mash.
Bake at 180 degrees Celsius for 20-25 minutes.
minutes before they’re done, add a bit more shredded cheese on top.