1-First Step: Cream the wet base. Beat ½ cup softened butter and ¾ cup sugar for 2 minutes until light and fluffy. This traps air for soft chewy blueberry muffin cookies. Add 1 egg, 1 tsp vanilla, and 1 tsp lemon zest. Mix until smooth, scraping sides as needed. Let this sit 1 minute to fully incorporate flavors.

2-Second Step: Prepare dry ingredients. In a separate bowl, whisk 1½ cups flour, ½ tsp baking powder, ¼ tsp baking soda, and ¼ tsp salt. These leaveners ensure bakery style rise without cakiness. Gently fold dry into wet mixture using a spatula. Stir just until no streaks remain, about 30 seconds. Overmixing leads to tough cookies.

3-Third Step: Handle blueberries carefully. Toss 1 cup fresh blueberries in 1 tbsp flour to coat. Fold them into the batter swiftly. This prevents sinking and color bleeding for even distribution. If using frozen, pat dry first and toss in 1½ tbsp flour as noted in FAQs.

4-Fourth Step: Make streusel topping. Combine ¼ cup flour, 2 tbsp sugar, and 2 tbsp cold butter. Rub with fingers until crumbly like wet sand. Set aside; this adds crunch to your muffin cookies.

5-Fifth Step: Scoop and shape dough. Use a 2-tablespoon scoop for 3-inch rounds. Place mounds 2 inches apart on parchment-lined sheets. Gently flatten tops and sprinkle generously with streusel. Press lightly to adhere.

6-Sixth Step: Bake to perfection. Slide into 375°F oven for 12-15 minutes. Edges turn golden while centers stay pale and soft. Rotate sheets halfway for even baking. Cool on pans 5 minutes, then transfer to racks. They firm up as they cool, yielding thick, fluffy results.

7-Final Step: Finishing touches and serving. Dust with powdered sugar if desired, or drizzle lemon glaze. Pair with coffee for breakfast or milk for snacks. Store as detailed later. These easy blueberry muffin cookies shine warm from the oven.