Put the almond milk in a bowl and warm it in the microwave until the temperature is between 100-110 degrees. (I use a candy thermometer). If the temperature is not within this range, the yeast will not rise properly.
Pour the warmed almond milk into a large mixing bow. Add the sugar and yeast to the bowl and stir. Let sit for 5 minutes. The yeast will become frothy on top.
Add the melted vegan butter and flour to the yeast mixture. Stir with a large wooden spoon until the dough comes together and pulls away from the sides.
Transfer the dough to a lightly floured surface and knead it for 4-5 minutes. Form it into a ball and place it back in the bowl. Cover with a towel and let it rise in a warm place for 30 minutes. The dough should double in size.
Preheat the oven to 375 degrees and grease a casserole dish. Lightly flour a clean countertop and using a rolling pin, roll the dough into a large rectangle that's approximately 1/2 inch thick.
Spread the softened butter on the rectangle, leaving approximately an inch of space at the edges. Sprinkle the brown sugar and cinnamon on top.
Starting with the long end closest to you, tightly roll the dough up. Cut the ends off and cut the dough into 10 equal rolls. Place the rolls in the greased casserole dish. Bake for 25-27 minutes or until the edges are light golden brown.
Whisk the powdered sugar, melted vegan butter, pure vanilla extract and almond milk together in a bowl. Pour over the rolls and enjoy!