Roast the toast and place on a baking sheet lined with baking paper. Pat the chicken breast dry, season with salt and pepper, fry until hot.
Then place the chicken breast on the toast. Slice the tomatoes and pour over the meat. On top of the sliced mozzarella. Season everything again sparingly with coarse pepper from the mill.
Put the whole thing in the oven preheated to 200 ° C for about 15-20 minutes.