1-First Step: Line an 8×8-inch pan with parchment paper, leaving overhang for easy removal. This prevents sticking and makes cutting simple. Crush 24 Oreos (two-thirds) into fine crumbs using a food processor or sealed bag with rolling pin. Save 12 Oreos for folding in later. Measure all ingredients ahead to keep things smooth. Softening cream cheese at room temp takes 30 minutes; speed it in microwave 10 seconds if rushed. Press half the crumbs firmly into the pan base using a glass bottom. This creates a sturdy oreo crust that contrasts creamy top. Chill pan briefly if crumbs are soft.

2-Second Step: In a large bowl, beat 8 oz softened cream cheese, 2 cups powdered sugar, and 1 tsp vanilla extract with electric mixer on medium speed. Aim for 2-3 minutes until fluffy and lump-free. Scrape sides often. This base gives your oreo cream cheese fudge its signature tang and hold. Taste and add pinch salt if needed. If mixture seems thick, add 1 tbsp milk. For smoother results, sift powdered sugar first.

3-Third Step: In microwave-safe bowl, combine 12 oz semi-sweet chocolate chips and 14 oz sweetened condensed milk. Heat in 30-second bursts, stirring after each. Takes 1.5-2 minutes total at 50% power to avoid scorching. Stir until glossy and smooth. Chocolate should reach 100-110°F for best emulsion. Pro tip: Double boiler works on stovetop for control. Cool slightly 2 minutes before next mix. Hot chocolate can curdle cream cheese.

4-Fourth Step: Pour melted chocolate into cream cheese mixture. Beat on low until uniform, about 1 minute. Fold in crushed remaining 12 Oreos gently with spatula to keep chunks intact. Add optional 1/2 cup mini marshmallows here for chewiness. Mixture thickens fast; work quickly. Spread evenly over crust, smoothing top with offset spatula. Sprinkle sea salt or top with whole Oreos for looks.

5-Final Step: Refrigerate 4 hours or overnight until firm. Lift parchment to remove, cut into 36 squares with sharp knife. Wipe blade between cuts for clean edges. Serve chilled or room temp for softer bite. Pairs with coffee or ice cream. Store as below. Troubleshooting: Too soft? Chill longer. Grainy? Better stirring next time.