Preheat the oven to 350 degrees Fahrenheit.
In a large mixing bowl, mix the sugar, lemon juice, oil, oat milk, and lemon extract. Stir until the sugar begins to dissolve.
Add the flour, baking powder, baking soda, salt, and poppy seeds into the mixing bowl. Stir only until combined and no streaks of flour remain. Do not overmix.
Transfer dough into a parchment-lined (or oiled) 9 x 5" loaf pan.
Bake at 350 degrees Fahrenheit for 40-50 minutes or until an inserted toothpick comes out clean.
Let cool slightly, slice, serve and enjoy!