Toss beef with sweet paprika, hot paprika, onion powder, garlic powder and salt.: The smell of powdered paprika coating raw beef is bright and fragrant, and tossing allows the spice to adhere so every piece develops flavor as it browns. This initial seasoning builds the flavor base that will slowly infuse into the sauce, which is why it is crucial to be thorough but not heavy handed. A frequent mistake is uneven coating, which causes some bites to be under seasoned; take an extra moment to rub the spices onto each piece so the color looks even and vibrant.
Heat a large skillet over medium heat and spray with cooking spray. Brown the beef on all sides in two batches. Transfer the beef to the slow cooker.: You will hear a pronounced sizzle when the beef hits the pan, and that sizzling backs away into gentle crackles as a crust forms, releasing nutty, caramel aromas. Browning develops Maillard flavors that deepen the final sauce and create complexity you cannot get without this step. Brown in two batches to avoid crowding, otherwise the meat will steam rather than sear and you lose that savory crust. If the pan smokes too much, reduce the heat slightly and wipe any burnt bits to prevent bitterness.
Add onion, garlic and flour to the pan the beef was cooked in; cook until aromatic, 2-3 minutes. Transfer to the slow cooker.: The chopped onion will soften and begin to take on color, and the smashed garlic will release a warm, toasty perfume when added. Sprinkling in the flour at this stage lets it toast slightly in the pan juices, which prevents raw flour taste and helps the sauce thicken later. Stir constantly so the flour absorbs the drippings and the mixture turns glossy, then scrape everything into the slow cooker. A common slip is letting the garlic burn, which gives a harsh bitterness, so keep the heat moderate and stir frequently.
Add bell pepper, beef broth, crushed tomato, caraway seed & brown sugar, if using to the slow cooker. Stir. Add bay leaf, cover and cook low 8 hours or high for 4 to 6 hours.: When you add the red bell pepper , the mixture will brighten visually, and the liquids will begin to steam as the lid goes on. The long, gentle heat allows the collagen in the beef to melt into gelatin, producing a silky mouthfeel that coats the spoon. The caraway seed contributes a faint licorice like aroma that unfolds slowly, while optional brown sugar tempers the acidity of the crushed tomato . Stir to combine so flavors distribute evenly, then nestle the bay leaf in the center. If you rush the timing or lift the lid constantly, you interfere with steady temperature, which can extend cooking time and prevent proper tenderizing.
Serve with sour cream and a sprinkling of caraway seeds, if desired.: The final touch of cool, tangy sour cream against warm goulash creates a pleasant temperature contrast and smoothness that brightens the paprika flavors. A light scatter of whole caraway seed adds texture and a fragrance lift. Taste before adding extras, because the slow cooking concentrates flavors and you may not need as much seasoning as expected. The most common error is over garnishing, which can obscure the balanced sauce you worked to build.