Mochi Cake, Any Way You Want It

Ingredients

• 6 Tbsp. unsalted butter or virgin coconut oil, melted, plus more for pan
• 1½ cups (300 g) sugar, plus more for pan
• 1 (13.5-oz.) can unsweetened coconut milk or 1⅔ cups half-and-half
• 2 large eggs
• 2 tsp. vanilla extract
• 1 tsp. kosher salt
• 2 cups (254 g) glutinous sweet rice flour, preferably Koda Farms Blue Star Mochiko
• 3 Tbsp. powdered flavoring of choice (such as unsweetened cocoa powder, pandan leaf powder, or malted milk powder) or 1 Tbsp. matcha powder plus 2 Tbsp. glutinous sweet rice flour or 3 Tbsp. glutinous sweet rice flour
• 1 tsp. ground spice of choice (such as cinnamon, cardamom, or turmeric)
• 1 tsp. baking powder
• ¼–⅓ cup unsweetened shredded coconut or sesame seeds

Directions

1. Preheat oven to 350°F. Generously butter a 9"-diameter cake pan or an 8x8" baking pan or 14 cups of two standard 12-cup muffin pans. (If you only have 1 muffin pan, you can bake the extra batter in a small loaf pan or mini muffin pan, or just discard it.) Generously coat pan with sugar, tapping out excess (about ¼ cup should do it).
2. Place 1½ cups (300 g) sugar and 6 Tbsp. butter in a large bowl. If using coconut milk, heat in a small saucepan over medium, whisking constantly, until no clumps remain, then whisk into sugar mixture. If using half-and-half, whisk directly into sugar mixture. Add eggs, vanilla, and salt and whisk to combine.
3. Whisk rice flour, powdered flavoring of choice (or 3 Tbsp. more rice flour), spice of choice, and baking powder in a medium bowl to combine, then whisk into egg mixture. Scrape batter into prepared pan and sprinkle with coconut or sesame seeds.
4. Bake until top begins to crack and cake springs back when gently pressed, 55–65 minutes for cake and 45–55 minutes for cupcakes. Transfer pan to a wire rack and let cake cool in pan 10 minutes. Run a knife around perimeter of cake, place a plate over pan, and invert cake onto plate. Hold wire rack over cake and invert cake onto rack (simply turn cupcakes out onto rack and turn over). Let cool completely.
5. Do ahead: Cake can be baked 5 days ahead. Store tightly wrapped at room temperature.