Prepare the ingredients

• Thinly slice the mushrooms and the onion.
• Mince the garlic and slice the green onion for garnish.

Loosen the udon noodles

• Bring water to a boil and add the frozen udon noodles just until loosened.
• Strain immediately.

Sauté garlic and onion

• Melt the butter in a pan over medium heat.
• Sauté the garlic and onion until softened.

Cook the mushrooms

• Toss in the mushrooms and add the water.
• Cook until tender and the liquid has evaporated.

Build the creamy sauce

• Add the oyster sauce, garlic powder, black pepper and heavy cream.
• Mix together and raise the heat to medium high.
• Simmer until the sauce has thickened.

Toss and serve

• Toss the udon noodles into the thickened sauce.
• Garnish with green onion and black sesame seeds.