Rhubarb Crumble Cake - Red Cottage Chronicles

Ingredients

• 2 cups all purpose flour
• 1 teaspoon bake soda
• 1 teaspoon salt
• 1/2 cup room temperature butter
• 1 ½ cups brown sugar
• 1 large egg
• 1 teaspoon pure vanilla extract
• 1 cup buttermilk (or soured milk)
• 1 1/2 cups chopped rhubarb (divided)
• Crumble Topping
• 1/2 cup ground almonds (almond flour)
• 1 cup all purpose flour
• 1/2 cup softened butter
• 1/2 cup slivered almonds