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Heat oven to 350F. Coat an 8-cup fluted tube pan with cooking spray.
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Boil water and pour 1 cup of water over the tea bags. Steep the tea in the water 3-5 minutes. Remove the tea bags and set the brewed tea aside.
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Using a mixer, beat the butter, eggs, and granulated sugar until fluffy. Blend in the melted chocolate. Beat in the flour, baking soda, baking powder, salt, yogurt, and brewed tea.
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Pour into pan. Bake 40-50 minutes or until a skewer inserted into the cake comes out with a few crumbs attached.
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Remove from oven and let stand 5 minutes. Turn out of pan and cool. Dust with powdered sugar, slice, and enjoy!