Preheat your oven to 350°F (175°C).

In a large pan over medium heat, sauté the onions, bell peppers, and garlic until they are softened.

Add the sauerkraut to the pan and sauté for another 2-3 minutes. Remove from heat and let it cool.

In a separate bowl, whisk together the eggs, milk, caraway seeds, salt, and pepper.

Spread half of the sauerkraut mixture on the bottom of the pre-made pie crust.

Layer half of the cheddar cheese and Swiss cheese over the sauerkraut.

Repeat the layering with the remaining sauerkraut and cheese.

Pour the egg mixture over the layers in the pie crust, making sure it seeps into the layers.

Bake the pie in the preheated oven for 35-40 minutes, or until the top is golden brown and the filling is set.

Let the pie cool for a few minutes before slicing into 8 pieces.