Pumpkin and Feta Muffins recipes

Name: Pumpkin and Feta Muffins recipes
Ingredients: 1 tablespoon unsalted butter; 2 tablespoons olive oil; 2 cups / 9 oz / 255g cubed pumpkin or butternut squash, 1/2-inch cubes; salt; pepper; 1 large handful of baby spinach, chopped; 2 tablespoons chopped parsley or cilantro; 3 tablespoons sunflower seeds kernels; 3/4 cup / 1 oz / 30g freshly grated Parmesan; 100g / 3.5 oz / 1/2 cup cubed feta; 2 teaspoons whole-grain mustard; 2 large eggs, lightly beaten; 3/4 cup / 180 ml milk; 2 cups flour (see headnote!); 4 teaspoons aluminum free baking powder; 1 teaspoon fine-grain sea salt