Take a saucepan and fill it with water, put the penne pasta in it.

Add oil and salt and let it boil until the pasta gets cooked.

Once the pasta gets cooked, stain the water and wash it with cold water then keep it aside.

For white sauce, take a saucepan and put butter in it.

Once the butter melts, add flour in it and stir for 1 minute.

Add milk and keep stirring until the mixture gets thicker in consistency.

Add salt, black pepper and chili flakes in it then keep it aside.

Now, take a big saucepan and put oil in it.

Add garlic and chicken, stir until the chicken gets cooked.

Add mushroom, capsicums and stir for 5 minutes.

Now add mayonnaise and tomato ketchup in it and mix everything well.

Add black pepper, chili flakes, salt and oregano and stir again for 5 minutes.

Now add the boiled pasta in it and mix well.

Add the white sauce and mix it with the pasta, then stir it for 3 minutes.

Turn off the flame and serve it hot.