In a small heatproof bowl, combine 1 cup boiling water and tea bags. Cover and let stand for 15 minutes. Squeeze excess liquid from bags; discard bags. Let tea cool completely.
Preheat oven to 325°. Spray a 13×9-inch cast-iron baking pan with baking spray with flour.
In a large bowl, whisk together melted butter and sugars until smooth; whisk in cooled tea, eggs, milk, and vanilla until well combined.
In a medium bowl, whisk together flour, baking powder, salt, and baking soda. Stir flour mixture into butter mixture until just combined. Spread batter into prepared pan.
Bake until a wooden pick inserted in center comes out clean, 35 to 40 minutes. Let cool completely in pan on a wire rack.
Spread Creamy Lemon Frosting onto cake. Loosely cover, and refrigerate for 30 minutes before serving. Garnish with lemon, if desired.
CREAMY LEMON FROSTING
In a large bowl, beat butter and cream cheese with a mixer at medium-low speed until smooth and creamy, stopping to scrape sides of bowl. Beat in zest.
With mixer on low speed, beat in confectioners’ sugar, 1 cup at a time, until well combined, stopping to scrape sides of bowl. Increase speed to medium; beat in cream and extract until thick and smooth. Use immediately.
Notes
KITCHEN TIP-You can also bake this cake in a 12-inch cast-iron skillet.
Recipe by Southern Cast Iron at https://southerncastiron.com/lemon-sweet-tea-cake/