Prepare the Sauce: In a small bowl, mix together the curry powder, turmeric powder, soy sauce, oyster sauce, sugar, and a pinch of salt. Set aside.

Heat the Wok: Place a wok or large skillet over medium-high heat. Add the vegetable oil and let it heat up.

Sauté Aromatics: Add the minced garlic to the hot oil and stir briefly until fragrant. Toss in the sliced onions and sauté until they turn translucent and slightly caramelized.

Stir-Fry Peppers: Throw in the julienned red and green bell peppers. Stir-fry for about 2 minutes until they start to soften but still retain their crunch.

Add the Crabs: Gently add the cleaned and cracked crabs to the wok. Use kitchen tongs to stir-fry them together with the veggies. Let them cook for 4-5 minutes, or until the crab shells turn a vibrant red hue.

Pour in the Sauce: Pour the prepared sauce over the crab and vegetables. Toss everything together to ensure even coating. Continue stir-frying for an additional 2-3 minutes, allowing the flavors to meld.

Season to Perfection: Season with salt and pepper according to your taste preferences. Remember, the soy sauce and oyster sauce already add some saltiness.

Serve: Once the crab meat is tender and infused with the curry flavors, remove the wok from the heat. Transfer the stir-fried crab to a serving plate.

Garnish and Final Touches: Sprinkle fresh cilantro leaves over the dish for a burst of color and aroma.