In a small bowl, combine 2 tablespoons dried minced onion, 2 tablespoons toasted sesame seeds, 1 tablespoon poppy seeds, 1 tablespoon dried minced garlic, 1 teaspoon flaked sea salt, and 1/4 teaspoon black pepper; toss to mix and set aside.
Measure 3 cups cooked cannellini or great northern beans (or use 2 cans, drained and rinsed). Add the beans to a food processor.
Add 1 whole head of roasted garlic to the food processor with the beans.
Pulse a few times, then process continuously until the beans begin to puree, about 2–3 minutes.
With the processor running, stream in 6 tablespoons olive oil followed by 2 tablespoons toasted sesame oil. Continue processing until the hummus is as smooth as you like, stopping to scrape down the sides as needed.
Add 1/4 teaspoon salt to the hummus and process briefly to combine; taste.
Transfer the hummus to a serving bowl, drizzle with additional olive oil, and evenly sprinkle the reserved seasoning mixture over the top.
Serve immediately with crackers.