In a deep pan, pour in enough light beer to cover the bratwursts fully. Poke holes in each bratwurst and bring to a boil, then simmer for about 20 minutes.

Melt 1.5 tablespoons of butter in a large skillet over medium heat. Add and stir the finely sliced yellow onions and cook for approximately 30 minutes until golden-brown.

Remove the brats from the pan and slice. Sauté the sliced brats in the same skillet for about 5 minutes until browned and crispy.

Preheat your oven to 400°F (200°C) for crispy pizza.

Roll out your pizza crust on a baking sheet. Distribute the mozzarella, caramelized onions, and bratwursts evenly over the crust.

Bake in the preheated oven for 12-15 minutes until cheese is melted and bubbling.

Remove from the oven and let cool for 5 minutes before slicing into small pieces.