Prepare Chicken Filling: In a frying pan, add cooking oil and chicken mince. Mix well and cook until the color changes. Add soy sauce, Himalayan pink salt, crushed black pepper, and crushed red chili. Mix well and cook on high flame until the mixture dries up. Add chopped onion, mix, and cook for 1-2 minutes. Let it cool. Add chopped spring onion leaves, mix well, and set aside.
Make Dough: In a bowl, combine all-purpose flour, Himalayan pink salt, and cooking oil. Mix well. Gradually add water and knead until a soft dough forms. Cover with cling film and let it rest for 15-20 minutes.
Roll and Shape Tortellini: Sprinkle dry flour and knead the dough again until smooth. Divide into 3 parts. Take one part, make a ball, sprinkle dry flour, and roll out as thin as possible using a rolling pin. Cut 5 to 6 round shapes using a 3-inch cutter. Cover with a kitchen towel. On each round dough, add prepared filling, fold, and shape into tortellini. Repeat with remaining dough to make 30-35 tortellini.
Steam Tortellini: Place greased baking paper in a bamboo steamer and add 5-6 tortellini. Place the bamboo steamer over boiling water, cover, and cook on low flame for 7-8 minutes. Dip steamed tortellini in dry flour and store in freezer for 2-3 weeks if desired. To reheat, steam directly on medium flame for 7-8 minutes without thawing.
Prepare Alfredo Sauce: In a frying pan, melt butter. Add chopped garlic and fry until light golden. Add sliced mushrooms and cook for 1 minute. Turn off the flame, add cream, and mix well. Turn on the flame again, gradually add milk while whisking. Add crushed red chili, white pepper powder, Himalayan pink salt, and crushed black pepper. Mix well. Add chicken stock and cook on low flame for 2-3 minutes.
Combine and Serve: Add steamed tortellini to the sauce and mix gently. Sprinkle crushed red chili and dried oregano on top. Serve hot.