Begin by rinsing the Napa cabbage under cold water. Remove any damaged outer leaves, then slice the cabbage in half lengthwise. Cut each half into bite-sized pieces, ensuring uniform size for even cooking.
In a large skillet or wok, heat the avocado oil over medium-high heat. Allow the oil to get hot, which will help in sautéing the cabbage quickly.
Add the minced garlic and ginger to the hot oil. Sauté for about 30 seconds until fragrant, being careful not to let them burn.
Add the chopped Napa cabbage to the skillet. Toss it gently to coat in the oil and aromatics. Sauté for about 5-7 minutes, stirring occasionally, until the cabbage is tender but still has a slight crunch.
Once the cabbage is cooked to your liking, add the red pepper flakes, soy sauce (or tamari), rice vinegar, and paprika. Stir well to combine all the flavors, cooking for an additional 1-2 minutes.
Drizzle the sesame oil over the cabbage and give it a final toss. Remove from heat, and sprinkle with sesame seeds for garnish before serving.