Yes, you can omit the buttermilk powder in ranch seasoning if you prefer or if you have dietary restrictions. The buttermilk powder is often included in traditional ranch seasoning for its tangy flavor, but you can still create a flavorful seasoning without it. If you choose to omit the buttermilk powder, you may need to adjust the quantities of other ingredients to balance the flavors. Additionally, keep in mind that without the buttermilk powder, the resulting seasoning mix may lack some of the characteristic tanginess associated with traditional ranch flavor.