In a bowl, search for the chicken and mix with the sour cream, pepper and cumin. In a large pan, sauté the garlic and onion in olive oil while adding the tomatoes, sugar, parsley, salt, pepper and cook until it boils down. Divide the filling into 10 tortillas and roll them. Put a little sauce in the casserole to cover the bottom and place the tortillas. Cover them with the rest of the sauce and the grated cheese. Bake in a preheated oven at 200C for about 20-25 minutes.