Vegan Matcha Donuts (Soft Baked Cake Donuts)

Ingredients

• 1 3/4 cups (220 g) all-purpose flour
• 2/3 cup (135 g) granulated sugar
• 2 teaspoons baking powder
• 1/4 teaspoon baking soda
• 2 teaspoons matcha powder, sifted
• 1/2 teaspoon fine salt
• 1/4 teaspoon ground nutmeg, optional
• 3/4 cup (180 ml) unsweetened plant milk
• 1 teaspoon apple cider vinegar
• 1 teaspoon vanilla extract
• 1/4 cup (60 ml) neutral oil, plus more for the pan
• 1 cup (120 g) powdered sugar
• 1 teaspoon matcha powder, sifted
• 2 tablespoons unsweetened plant milk, plus more as needed
• 1/2 teaspoon vanilla extract
• Pinch of fine salt