Preheat oven to 350* F. Grease an 8 ½"x 4 ½" loaf pan and line with a parchment sling for easy removal cake removal.
In a small bowl, combine non-dairy yogurt, non-dairy milk, lemon juice, and vanilla. Stir to combine and set aside.
½ Cup Unsweetened Non-Dairy Yogurt, ½ Cup Non-Dairy Milk, 1 tablespoon Lemon Juice, 1 teaspoon Vanilla Extract
In a medium bowl, combine flour, baking powder, baking soda, and salt. Stir to combine and set aside.
2 Cups All-Purpose Flour, 1 ½ teaspoon Baking Powder, ½ teaspoon Baking Soda, ½ teaspoon Kosher Salt
In the bowl of a stand mixer fitted with the paddle attachment or in a large bowl using a hand mixer, cream non-dairy butter, sugar, and lemon zest together until well combined and fluffy.
10 tablespoon Non-Dairy Butter, 1 Cup Granulated Sugar, 1 tablespoon Lemons, Zested
Into the mixer, add half of the milk and yogurt mixture. Mix on low to combine and scrape the bowl down using a rubber spatula.
Now, add half of the flour mixture and mix on low until just combined. Scrape the sides of the bowl down again.
Next, add the remaining liquid mixture and mix on low again until just combined. Scrape the sides of the bowl down using a rubber spatula.
Add the poppy seeds and the remaining dry mixture to the bowl. Mix until just combined.
2 tablespoon Poppy Seeds
Remove the bowl from the mixer and use a spatula to scrape the bowl down and fold the mixture a couple of times to ensure everything is evenly mixed.
Scrape batter into prepared 8 ½" x 4 ½" loaf pan, smoothing the top out with the back of the spatula.
Bake in a 350* F oven for 55-58 minutes, turning the loaf halfway through baking. Test for doneness by inserting a toothpick into the center of the loaf. It's done when the toothpick comes out clean.