Spinach-And-Romaine Salad With Cucumbers, Radishes, And Creamy Mint Dressing (Janie'S Spinach Salad)

Ingredients

• 1 (5-oz.) pkg. baby spinach
• 2 romaine lettuce hearts, chopped
• 2 cucumbers, cut into 1-inch pieces
• 1 cup thinly sliced radishes
• 1 small shallot, minced
• 2 tablespoons white wine vinegar
• 2 tablespoons fresh lemon juice
• 1/4 cup sour cream
• 1 cup half-and-half
• 1/2 cup chopped fresh mint, plus leaves for garnish
• 1/4 teaspoon kosher salt
• 1/8 teaspoon black pepper
• 1/2 cup crumbled feta cheese