Preheat your oven to 350°F.

While it’s warming up, grease a 9×13 inch baking dish with butter.

Preparing your baking dish first saves time later!

Peel and slice the potatoes thinly.

Using a mandoline slicer can make this quick and ensure even slices.

Consistency is key for even cooking.

Sauté the fennel and onions in a skillet with the butter over low heat.

Cook until they become soft but not browned.

This usually takes about 10 minutes.

In a large bowl, mix together the potatoes, sautéed vegetables, cream, cheese, salt, and pepper.

Make sure everything is well combined.

The cheese and cream should coat the potatoes nicely.

Pour the mixture into your prepared dish.

Press it down gently with a wooden spoon.

This ensures your baking is even.