Chocolate-Amaretto Mousse Pie

Ingredients (8)

• 1 teaspoon plus 1/2 cup butter, divided
• 2 cups semisweet chocolate chips, divided
• 1 can (14 ounces) sweetened condensed milk
• 1/4 teaspoon salt
• 1/4 cup water
• 1/2 cup amaretto
• 2 cups heavy whipping cream, whipped
• 1/4 cup slivered almonds, toasted