Peel and finely chop the onion, carrots and garlic. Remove the films from the chicken breast fillet and cut into small pieces. Grind in a meat grinder. Pour boiling water over the tomatoes and remove the skins. Prepare a baking dish. Turn the oven on 180 degrees.
Make sauce with chicken breast. Heat vegetable oil in a frying pan. Place onions, carrots and garlic in it. Simmer the vegetables until soft, about 5-7 minutes. Then add minced chicken to them. Continue frying until the meat changes color. Add sugar, spices (salt, pepper, Italian herbs), tomato paste and tomato pulp. Mix everything well. Cover the pan and simmer over medium heat for 30 minutes.
Prepare bechamel sauce. Melt the butter in a saucepan. Sprinkle flour over it and stir. Gradually pour in the milk, remembering to stir so that lumps do not form. Add salt and pepper. Simmer the sauce until thickened, 7-10 minutes.
Bake chicken lasagna. Grease a baking dish with a small amount of vegetable oil. Then add the meat sauce, then the bechamel and top with the lasagne sheets. Repeat the process until you run out of food. Sprinkle cheese on top of lasagna. Place the mold in the oven, preheated to 180 degrees, for 40 minutes.
Before serving, cut the lasagna into portions and cool for 15 minutes.