1. Preheat oven to 350°F. Lightly grease a doughnut pan with nonstick cooking spray and set aside.
2. Melt 3 tablespoons butter in a small saucepan over medium-low heat, stirring occasionally. Butter will crackle and foam a bit as it browns. Once butter is light brown and smells nutty, remove from heat and immediately transfer to a small bowl. Be careful, it goes from brown butter to black burnt butter quickly. Allow brown butter to completely cool.
3. In a medium mixing bowl, whisk together flour, sugar, baking powder, cinnamon, and salt.
4. In a small mixing bowl, whisk together egg, horchata, and vanilla extract. Measure out 2 tablespoons of the cooled browned butter and whisk into the wet ingredients.
5. Add wet ingredients to dry ingredeints. Stir together until ingredients are well combined, but do not overmix.
6. Spoon batter into a large ziploc bag and use a scissor to cut about a 1/2" piece off one corner to create a makeshift disposable pastry bag. Fill each well in the doughnut pan approximately 3/4 full. Alternatively, use a spoon to carefully fill donut pan and smooth out batter.
7. Place in the oven and bake for approximately 12 minutes, or until a toothpick inserted into doughnut comes out clean. Remove from the oven and allow to cool in the pan before inverting onto a wire rack to cool completely.
8. In a small mixing bowl, thoroughly combine 3 tablespoons of horchata with powdered sugar to make a glaze. Drizzle glaze over donuts or preferably, dip the top of each donut in the glaze to coat. Allow glaze to harden, then devour.

for the Horchata

1. In a glass bowl or pitcher, add rice, hot water, and cinnamon stick. Cover and let sit overnight on the counter. The next day, pour the mixture into a blender, add 1/3 cup sugar, and blend on high for several minutes until smooth. There will be some grit from the rice. Strain well through a very fine mesh sieve or a cheesecloth into a pitcher. Stir in almond milk and vanilla extract. Refrigerate for a couple hours to allow flavors to meld. Stir before use. Extra horchata can be enjoyed straight up as a refreshing beverage or mixed with a bit of vanilla vodka for a creative martini.