Lingonberry sour cream coffee cake

Ingredients

• 1 cup light brown sugar
• 1 +1/2 tsp cinnamon
• 1 +1/2 sticks cold unsalted butter (cut into small pieces)
• 1 +1/2 cup chopped pecans (optional)
• Salt to taste
• 1 1/2 cup flour
• 1 stick butter
• 1 +1/4 tsp baking powder
• 1/2 tsp baking soda
• 1/4 tsp salt
• 1 cup white sugar
• 2 large eggs
• 1 +1/2 tsp vanilla
• 1 cup sour cream
• 1 cup Felix lingonberry jam
• 1 cup powdered sugar
• 1 tbsp whole milk
• 1 tbsp Felix lingonberry jam