01 -
Warm up your oven to 350°F (175°C). Combine ground cinnamon and sugar in a small dish. Coat two loaf pans with grease, then sprinkle the cinnamon-sugar mix all over the inside of each pan, including the sides.
02 -
Grab a big bowl and stir together the yellow cake mix, both pistachio pudding packs, eggs, oil, water, and sour cream. Stir until the mixture is smooth and lump-free, though it’ll be on the thick side.
03 -
Evenly distribute the batter into the two pans you prepped earlier, making sure to smooth the tops.
04 -
Pop the pans into the oven and bake for about 45 minutes. You’ll know they’re done when a toothpick poked in the center comes out dry. Cool the loaves in the pans for 10 minutes, then move them to a wire rack to finish cooling.
05 -
Whisk confectioners' sugar, melted butter, almond extract, and vanilla extract in a medium bowl. Add the milk one spoonful at a time, whisking between additions. Stop when you get a thick but pourable glaze.
06 -
Once the loaves are no longer warm, drizzle on the icing. Before the glaze hardens, sprinkle some pistachios on top. Let everything set before slicing and serving.