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Grease a 9"x13" cake pan (or line it with parchment paper or aluminum foil and grease the sides and bottom). Set aside.
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Preheat the oven to 350 degrees F.
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In a large mixing bowl, whisk together flour, salt, sugar and baking powder.
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Add milk, eggs and vanilla and whisk until smooth.
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Slowly add the melted butter and whisk until everything is smooth.
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Spread the batter in the prepared pan. Set aside.
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In a medium mixing bowl, beat butter with electric mixer until creamy.
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Add sugar, flour and
cinnamon and beat until fluffy, about 2 minutes. (It will look crumbly
at first but keep beating, it will come together.)
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Spread the filling
over the cake batter, leaving at least 1 inch of space from the edge of
the pan. Swirl gently with a off-set icing spatula or a rubber spatula.
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Bake the cake for 28 to 32 minutes or until the toothpick inserted in the cake part comes out clean.
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Cool the cake for 15 minutes. Pour the glaze over the cake and spread evenly.