Old-Fashioned Butterscotch Cake

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Cake:

2 large eggs

Nonstick baking spray

2 1/2 cups sifted cake flour (sift before measuring)

2 teaspoons baking powder

Salt

1 1/2 cups light brown sugar

1/4 cup sugar

1 1/2 cups half-and-half or whole milk, at room temperature

3/4 cup safflower oil or canola oil

2 teaspoons pure vanilla extract

Frosting:

4 tablespoons, plus 1/2 cup water

2 teaspoons unflavored powdered gelatin

2 cups light brown sugar

1/2 cup half-n-half or whole milk

1/2 cup water

1 1/4 pounds unsalted butter (5 sticks), at room temperature

2 teaspoons pure vanilla extract

Butterscotch Sauce:

4 tablespoons unsalted butter

1 cup light brown sugar

1 teaspoon fresh lemon juice

Salt

3/4 cup heavy cream

2 teaspoons pure vanilla extract